Aviation in World War I
Encyclopedia
World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 was the first war in which aircraft
Aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

 were deployed on a large scale. Tethered observation balloon
Observation balloon
Observation balloons are balloons that are employed as aerial platforms for intelligence gathering and artillery spotting. Their use began during the French Revolutionary Wars, reaching their zenith during World War I, and they continue in limited use today....

s had already been employed in several wars, and would be used extensively for artillery spotting. Germany
German Empire
The German Empire refers to Germany during the "Second Reich" period from the unification of Germany and proclamation of Wilhelm I as German Emperor on 18 January 1871, to 1918, when it became a federal republic after defeat in World War I and the abdication of the Emperor, Wilhelm II.The German...

 employed Zeppelin
Zeppelin
A Zeppelin is a type of rigid airship pioneered by the German Count Ferdinand von Zeppelin in the early 20th century. It was based on designs he had outlined in 1874 and detailed in 1893. His plans were reviewed by committee in 1894 and patented in the United States on 14 March 1899...

s for reconnaissance
Reconnaissance
Reconnaissance is the military term for exploring beyond the area occupied by friendly forces to gain information about enemy forces or features of the environment....

 over the North Sea
North Sea
In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...

 and strategic bombing
Strategic bombing
Strategic bombing is a military strategy used in a total war with the goal of defeating an enemy nation-state by destroying its economic ability and public will to wage war rather than destroying its land or naval forces...

 raids over England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.

Aeroplanes were just coming into military use at the outset of the war. Initially, they were used mostly for reconnaissance
Reconnaissance
Reconnaissance is the military term for exploring beyond the area occupied by friendly forces to gain information about enemy forces or features of the environment....

. Pilots and engineers learned from experience, leading to the development of many specialized types, including fighters
Fighter aircraft
A fighter aircraft is a military aircraft designed primarily for air-to-air combat with other aircraft, as opposed to a bomber, which is designed primarily to attack ground targets...

, bombers, and ground-attack aeroplanes.

Ace
Fighter Ace
Fighter Ace was a massively multiplayer online computer game in which one flies World War II fighter and bomber planes in combat against other players and virtual pilots...

 fighter pilots were portrayed as modern knights, and many became popular heroes. While the impact of aircraft on the course of war was limited, many of the lessons learned would be applied in future wars.

Prewar developments

About 10 years after the Wright brothers made the first powered flight, there was still much to be improved upon. Because of limitations of the engine power of the time, the effective payload of aircraft was extremely limited. They were made mostly of hardwood (braced with steel wires
Flying wires
The flying wires of an aircraft work in conjunction with other wing components such as spars and interplane struts to transmit flight loads. Most commonly used on biplane aircraft they are also used on monoplanes and triplanes.-Purpose:...

) and linen
Linen
Linen is a textile made from the fibers of the flax plant, Linum usitatissimum. Linen is labor-intensive to manufacture, but when it is made into garments, it is valued for its exceptional coolness and freshness in hot weather....

 fabric doped with flammable liquid to give them the stiffness required to form a wing surface.

Aside from these primitive materials, the rudimentary aviation engineering of the time meant most aircraft were structurally fragile by later standards, and not infrequently broke up in flight especially when performing violent combat manoeuvres such as pulling up from steep dives.

As early as 1909, these evolving flying machines were recognised to be not just toys, but weapons:
In 1911, Captain Bertram Dickson, the first British military officer to fly and the first to engage on an aerial reconnaissance mission in a fixed-wing aircraft during army manoeuvres in 1910, predicted, in a submission to the UK Technical Sub-Committee for Imperial Defence
Committee of Imperial Defence
The Committee of Imperial Defence was an important ad hoc part of the government of the United Kingdom and the British Empire from just after the Second Boer War until the start of World War II...

, the military use of aircraft and the ensuing development and escalation of aerial combat: "In case of a European war, between two countries, both sides would be equipped with large corps of aeroplanes, each trying to obtain information on the other... the efforts which each would exert in order to hinder or prevent the enemy from obtaining information... would lead to the inevitable result of a war in the air, for the supremacy of the air, by armed aeroplanes against each other. This fight for the supremacy of the air in future wars will be of the greatest importance...".

The first operational use of fixed-wing aircraft in war took place on 23 October 1911 in the Italo-Turkish War
Italo-Turkish War
The Italo-Turkish or Turco-Italian War was fought between the Ottoman Empire and the Kingdom of Italy from September 29, 1911 to October 18, 1912.As a result of this conflict, Italy was awarded the Ottoman provinces of Tripolitania, Fezzan, and...

, when Captain Carlo Piazza made history's first wartime reconnaissance flight near Benghazi
Benghazi
Benghazi is the second largest city in Libya, the main city of the Cyrenaica region , and the former provisional capital of the National Transitional Council. The wider metropolitan area is also a district of Libya...

 in a Blériot XI
Blériot XI
The Blériot XI is the aircraft in which, on 25 July 1909, Louis Blériot made the first flight across the English Channel made in a heavier-than-air aircraft . This achievement is one of the most famous accomplishments of the early years of aviation, and not only won Blériot a lasting place in...

. The first aerial bombardment followed shortly thereafter, on 1 November, when Second Lieutenant Giolio Gavotti dropped four bombs on two oases held by the Turks. The first aerial photography flight took place later in March 1912, also flown by Captain Piazza.

The early years of war

From the very start, there was some debate over the uses (or usefulness) of aircraft in warfare. Many senior officers, in particular, remained skeptical.

In Germany the great successes of the early Zeppelin
Zeppelin
A Zeppelin is a type of rigid airship pioneered by the German Count Ferdinand von Zeppelin in the early 20th century. It was based on designs he had outlined in 1874 and detailed in 1893. His plans were reviewed by committee in 1894 and patented in the United States on 14 March 1899...

 airships had largely overshadowed the importance of heavier-than-air aircraft. Out of a paper strength of about 230 aircraft belonging to the army in August 1914 only 180 or so were of any use. The French military aviation exercises of 1911, 1912, and 1913 had pioneered cooperation with the cavalry (reconnaissance) and artillery (spotting), but the momentum was if anything slacking.

Great Britain had "started late" and initially relied largely on the French aircraft industry, especially for aircraft engines. The initial British contribution to the total allied airwar effort in August 1914 (of about 184 aircraft) was three squadrons with about 30 serviceable machines. The American army and navy air services were hopelessly behind; even in 1917, when the United States entered the war, they were to be almost totally dependent on the French and British aircraft industries for combat aircraft.

The initial campaigns of 1914 proved that cavalry
Cavalry
Cavalry or horsemen were soldiers or warriors who fought mounted on horseback. Cavalry were historically the third oldest and the most mobile of the combat arms...

 could no longer provide the reconnaissance expected by their generals, in the face of the greatly increased firepower of Twentieth century armies. It was quickly realised, on the other hand, that aircraft
Aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

 could at least locate the enemy, even if early air reconnaissance was hampered by the newness of the techniques involved. Early scepticism and low expectations quickly turned to unrealistic demands beyond the capabilities of the primitive aircraft available.

Even so, air reconnaissance played a critical role in the "war of movement" of 1914, especially in helping the Allies halt the German invasion of France. On 22 August 1914, British Captain L.E.O. Charlton
Lionel Charlton
Air Commodore Lionel Evelyn Oswald Charlton CB, CMG, DSO, RAF was a British infantry officer who served in the Second Boer War. During World War I, Charlton held several command and staff posts in the Royal Flying Corps, finishing the war as a brigadier-general...

 and Lieutenant V.H.N. Wadham reported German General Alexander von Kluck
Alexander von Kluck
Alexander Heinrich Rudolph von Kluck was a German general during World War I.- Military career :He enlisted in the Prussian army in time to serve in the seven-week Austro-Prussian War of 1866 and the Franco-Prussian War, where he was wounded twice in the Battle of Colombey-Neuilly...

's army was preparing to surround the BEF, contradicting all other intelligence. The British High Command listened to the report and started a withdrawal toward Mons, saving the lives of 100,000 soldiers. Later, during the First Battle of Marne, observation planes discovered weak points and exposed flanks in the German lines, allowing the allies to take advantage of them. The Germans' great air "coup" of 1914 (at least according to contemporary propaganda) was at the Battle of Tannenberg
Battle of Tannenberg (1914)
The Battle of Tannenberg was an engagement between the Russian Empire and the German Empire in the first days of World War I. It was fought by the Russian First and Second Armies against the German Eighth Army between 23 August and 30 August 1914. The battle resulted in the almost complete...

 in East Prussia
East Prussia
East Prussia is the main part of the region of Prussia along the southeastern Baltic Coast from the 13th century to the end of World War II in May 1945. From 1772–1829 and 1878–1945, the Province of East Prussia was part of the German state of Prussia. The capital city was Königsberg.East Prussia...

 where an unexpected Russian attack was reported by Lts. Canter and Mertens, resulting in the Russians' being forced to withdraw.

Early Western Front reconnaissance duties

Late in 1914 the lines between the Germans invading France and the Allies stretched from the North Sea to the Alps. The initial "war of movement" largely ceased, and the front became static. Three main functions of short range reconnaissance squadrons had emerged by March 1915.

The first was photographic reconnaissance – building up a complete mosaic map of the enemy trench system. The first air cameras used glass plates (Kodak cellulose film had been invented, but did not at this stage have sufficient resolution).

Artillery "spotting" enabled the ranging of artillery on targets invisible to the gunners. Radio telephony was not yet practical from an airplane, so communication was a problem. By March 1915, a two seater on "artillery observation" duties was typically equipped with a primitive radio transmitter transmitting the dots and dashes of a Morse key, but had no receiver. The artillery battery signalled to the aircraft by laying strips of white cloth on the ground in prearranged patterns. These duties were shared with the tethered observation balloon
Balloon (aircraft)
A balloon is a type of aircraft that remains aloft due to its buoyancy. A balloon travels by moving with the wind. It is distinct from an airship, which is a buoyant aircraft that can be propelled through the air in a controlled manner....

s. Balloonists could communicate directly with their batteries by field telephone, but were obviously far less flexible in locating targets and reporting the fall of shot.

"Contact patrol" work attempted to follow the course of a battle by communicating with advancing infantry while flying over the battlefield. The technology of the period did not permit radio contact, while methods of signalling were necessarily crude, including dropping messages from the aircraft. Soldiers were initially reluctant to reveal their positions to aircraft, as they (the soldiers) found distinguishing between friend and foe problematic.

Reconnaissance flying, like all kinds, was a hazardous business. In April 1917, the worst month for the entire war for the RFC, the average life expectancy of a British pilot on the Western Front was 93 flying hours.

Early bombing efforts

Typical 1914 aircraft could carry only very small bomb loads – the bombs themselves, and their stowage, were still very elementary, and effective bomb sights were still to be developed. Nonetheless the beginnings of strategic and tactical bombing date from the earliest days of the war. Notable are the raids by the RNAS on the German airship sheds at Düsseldorf, Cologne and Friedrichhafen in September, October and November 1914, as well as the formation of the Brieftauben Abteilung Ostende (or "Ostend carrier pigeon detachment", cover name for the first German strategic bombing unit), which mounted the first token raid over the English Channel in December.

The dawn of air combat

As Dickson had predicted, initially air combat was extremely rare, and definitely subordinate to reconnaissance. There are even numerous stories of the crew of rival reconnaissance aircraft exchanging nothing more belligerent than smiles and waves. This soon progressed to throwing brick
Brick
A brick is a block of ceramic material used in masonry construction, usually laid using various kinds of mortar. It has been regarded as one of the longest lasting and strongest building materials used throughout history.-History:...

s, grenades, and other objects, even rope
Rope
A rope is a length of fibres, twisted or braided together to improve strength for pulling and connecting. It has tensile strength but is too flexible to provide compressive strength...

, which they hoped would tangle the enemy aircraft's propeller
Propeller (aircraft)
Aircraft propellers or airscrews convert rotary motion from piston engines or turboprops to provide propulsive force. They may be fixed or variable pitch. Early aircraft propellers were carved by hand from solid or laminated wood with later propellers being constructed from metal...

. The first aircraft brought down by another was an Austrian reconnaissance rammed
Ramming
In warfare, ramming is a technique that was used in air, sea and land combat. The term originated from battering ram, a siege weapon used to bring down fortifications by hitting it with the force of the ram's momentum...

 on 8 September 1914, by Russian pilot Pyotr Nesterov
Pyotr Nesterov
Pyotr Nikolayevich Nesterov was a Russian pilot, an aircraft technical designer and an aerobatics pioneer.-Life and career:The son of a military academy teacher, Pyotr Nesterov decided to choose a military career. In August 1904 he left the military school in Nizhny Novgorod and went to the...

 in Galicia in the Eastern Front
Eastern Front (World War I)
The Eastern Front was a theatre of war during World War I in Central and, primarily, Eastern Europe. The term is in contrast to the Western Front. Despite the geographical separation, the events in the two theatres strongly influenced each other...

 (both planes crashed as the result of the attack killing all occupants). Eventually pilots began firing handheld firearm
Firearm
A firearm is a weapon that launches one, or many, projectile at high velocity through confined burning of a propellant. This subsonic burning process is technically known as deflagration, as opposed to supersonic combustion known as a detonation. In older firearms, the propellant was typically...

s at enemy aircraft. On October 5, 1914, French pilot Louis Quenault opened fire on a German aircraft with a machine gun. Quenault reported history's first air-to-air kill. The era of air combat proper began as more and more aircraft were fitted with machine guns.

The pusher solution

As early as 1912, designers at the British firm Vickers
Vickers Limited
Vickers Limited was a famous British engineering conglomerate that merged into Vickers-Armstrongs in 1927.-Early history:Vickers was formed in Sheffield as a steel foundry by the miller Edward Vickers and his father-in-law George Naylor in 1828. Naylor was a partner in the foundry Naylor &...

 were experimenting with machinegun-carrying aircraft. The first concrete result was the Vickers Experimental Fighting Biplane 1, which featured at the 1913 aero show and appeared in developed form as the FB.5
Vickers F.B.5
The Vickers F.B.5 was a British two-seat pusher military biplane of the First World War...

 in February 1915. This pioneering fighter
Fighter aircraft
A fighter aircraft is a military aircraft designed primarily for air-to-air combat with other aircraft, as opposed to a bomber, which is designed primarily to attack ground targets...

, like the Royal Aircraft Factory F.E.2b and the Airco DH.1
Airco DH.1
|-See also:-References:NotesCitationsBibliography* Grey, C. G. Jane's All the World's Aircraft 1919 . New York: Arco Publishing Company, 1969. ISBN 0-0001-890-1....

, was a pusher
Pusher configuration
In a craft with a pusher configuration the propeller are mounted behind their respective engine. According to Bill Gunston, a "pusher propeller" is one mounted behind engine so that drive shaft is in compression...

  type. The pusher design had the engine and propeller behind the pilot, facing backward, rather than in front, as in a tractor
Tractor configuration
thumb|right|[[Evektor-Aerotechnik|Aerotechnik EV97A Eurostar]], a tractor configuration aircraft, being pulled into position by its pilot for refuelling....

 type. This provided an optimal machinegun position, which could be fired directly forward without an obstructing propeller, and reloaded and cleared in flight. An important drawback was that pusher designs – because of the struts and rigging necessary to hold their tail units, and the extra drag this entailed – tended at best to have an inferior performance to tractor types with the same engine power. Although the F.E.2d, a more powerful version of the F.E.2b, remained a formidable opponent well into 1917, pusher fighters were already obsolete. The problem was simply that were too slow to catch their quarry.

Machine gun synchronisation

The forward firing gun of a pusher "gun carrier" provided some offensive capability – the mounting of a machine gun firing to the rear from a two seater tractor aircraft gave defensive capability. There was an obvious need for some means to fire a machine gun forward from a tractor aircraft, especially from one of the small, light, "scout
Scout (aircraft)
The term scout, as a description of a class of military aircraft, came into use shortly before the First World War, and referred to a light reconnaissance aircraft, initially unarmed. "Scout" types were generally adaptations of pre-war racing aircraft – although at least one was specifically...

" aircraft, adapted from pre-war racers, that were to perform most air combat duties for the rest of the war. It would seem most natural to place the gun between the pilot and the propeller, to be able to aim it as well as service it during a gun jam. However, this presents an obvious problem, a percentage of the bullets will actually strike the propeller, quickly destroying it.

Early experiments with synchronised
Interrupter gear
An interrupter gear is a device used on military aircraft and warships in order to allow them to target opponents without damaging themselves....

 machine guns were carried out before the war in several countries. Franz Schneider
Franz Schneider
Franz Schneider was an engineer granted the first patent on 15 July 1913 for a synchronisation device allowing a machine gun to fire between an aircraft's spinning propeller blades...

, the former Nieuport
Nieuport
Nieuport, later Nieuport-Delage, was a French aeroplane company that primarily built racing aircraft before World War I and fighter aircraft during World War I and between the wars.-Beginnings:...

 designer now working for the L.V.G. concern in Germany, patented a synchronisation gear on 15 July 1913. An early Russian gear was designed by a Lieutenant Poplavko, and the Edwards Brothers in England designed the first British example. Finally, the Morane-Saulnier
Morane-Saulnier
Aéroplanes Morane-Saulnier is a French aircraft manufacturing company formed in October 1911 by Raymond Saulnier and the Morane brothers, Leon and Robert...

 company were working on the problem in 1914. All these early gears failed to attract official attention, partly due to official inertia and partly due to the terrifying results of failures of these early synchronising gears, which included dangerously ricocheting bullets as well as disintegrating propellers.

The Lewis gun, used on many early Allied aircraft, proved next to impossible to successfully synchronise due to its open bolt
Open bolt
A semi or full automatic firearm is said to fire from an open bolt if, when ready to fire, the bolt and working parts are held to the rear. When the trigger is pulled the bolt goes forward, feeding a round from the magazine into the chamber and firing it...

 firing cycle. In an open bolt firing cycle, it is impossible to predict the exact time any given round will fire, and for obvious reasons this is an unattractive characteristic in a weapon one is attempting to fire between the spinning blades of a propeller. Photographs of apparently synchronised Lewis gun mountings on RNAS
Royal Naval Air Service
The Royal Naval Air Service or RNAS was the air arm of the Royal Navy until near the end of the First World War, when it merged with the British Army's Royal Flying Corps to form a new service , the Royal Air Force...

 aircraft were probably in fact free firing – hardly a satisfactory solution.

The Maxim gun
Maxim gun
The Maxim gun was the first self-powered machine gun, invented by the American-born British inventor Sir Hiram Maxim in 1884. It has been called "the weapon most associated with [British] imperial conquest".-Functionality:...

s used by both the Allies (as the Vickers
Vickers machine gun
Not to be confused with the Vickers light machine gunThe Vickers machine gun or Vickers gun is a name primarily used to refer to the water-cooled .303 inch machine gun produced by Vickers Limited, originally for the British Army...

) and Germany (as the LMG 14 Parabellum and LMG 08 Spandau
Maschinengewehr 08
The Maschinengewehr 08, or MG08, was the German Army's standard machine gun in World War I and is an adoption of Hiram S. Maxim's original 1884 Maxim Gun. It was produced in a number of variants during the war. The MG 08 remained in service until the outbreak of World War II due to shortages of...

) had a closed bolt
Closed bolt
A semi or full-automatic firearm which is said to fire from a closed bolt is one where, when ready to fire, a round is in the chamber and the bolt and working parts are forward...

 firing cycle that started with a bullet already in the breech and the breech closed, so the firing of the bullet was the next step in the cycle. This meant that the exact instant the round would be fired could be predicted, making these weapons considerably easier to synchronise.

The standard French light machine gun, the Hotchkiss
Hotchkiss machine gun
Hotchkiss machine gun:*Hotchkiss M1909, light machine gun also known as the "Hotchkiss Mark I" in British service*Hotchkiss M1914, medium machine gun*Hotchkiss M1922, light machine gun*13.2 mm Hotchkiss machine gun, heavy machine gun...

, was also most unamenable to synchronisation due to rounds "hanging fire" – the Morane-Saulnier company designed a "safety backup" in the form of "deflector blades" (metal wedges) fitted to the propeller at the point where they would be struck by a bullet. Roland Garros trialled this system in a Morane-Saulnier L in April 1915. He managed to score several kills, although it proved to be an inadequate and dangerous solution. Garros eventually was forced by engine failure (possibly caused by the repeated strain on his aircraft's crankshaft of the "deflected" bullets striking his propeller) to land behind enemy lines, and he, and his aircraft, were captured by the Germans.

Famously, the German High Command passed Garros' Morane to the Fokker
Fokker
Fokker was a Dutch aircraft manufacturer named after its founder, Anthony Fokker. The company operated under several different names, starting out in 1912 in Schwerin, Germany, moving to the Netherlands in 1919....

 company – who already produced Morane type monoplanes for the German Air Service – with orders to copy the latest design. The deflector system was totally unsuitable for the steel jacketed German ammunition so that the Fokker engineers were forced to revisit the synchronisation idea (perhaps infringing Schneider's patent) resulting in the Eindecker
Fokker Eindecker
The Fokker Eindecker was a German World War I monoplane single-seat fighter aircraft designed by Dutch engineer Anthony Fokker. Developed in April 1915, the Eindecker was the first purpose-built German fighter aircraft and the first aircraft to be fitted with synchronizer gear, enabling the pilot...

 fighter series. Crude as these little monoplanes were, they produced a period of German air superiority, known as the "Fokker Scourge
Fokker Scourge
The Fokker Scourge was a term coined by the British press in the summer of 1915 to describe the then-current ascendancy of the Fokker Eindecker monoplane fighters of the German Fliegertruppen over the poorly-armed Allied reconnaissance types of the period....

" by the Allies. The psychological effect exceeded the material – the Allies had up to now been more or less unchallenged in the air, and the vulnerability of their older reconnaissance aircraft, especially the British B.E.2
Royal Aircraft Factory BE.2
The Royal Aircraft Factory B.E.2 was a British single-engine two-seat biplane which was in service with the Royal Flying Corps from 1912 until the end of World War I. The "Bleriot" in its designation refers to the fact that, like the Bleriot types it was of tractor configuration, with the...

 and French Farman pushers, came as a very nasty shock.

Other methods

Another method used at this time to fire a machine gun forward from a tractor design was to mount the gun to fire above the propeller arc. This required the gun to be mounted on the top wing of biplanes and be propped up and secured by complicated, drag inducing mounting in monoplanes. Reaching the gun so that drums or belts could be changed, or jams cleared, presented problems even when the gun could be mounted relatively close to the pilot. Eventually the excellent Foster mounting
Foster mounting
In early 1916 Sergeant Foster of No. 11 Squadron RFC devised a sliding rail mounting for the upper wing Lewis Gun on a Nieuport 11. It enabled the gun to be pulled down so that its breech was conveniently in front of the pilot, making it much easier to change ammunition drums or to clear stoppages...

 became more or less the standard way of mounting a Lewis gun in this position in the R.F.C.
Royal Flying Corps
The Royal Flying Corps was the over-land air arm of the British military during most of the First World War. During the early part of the war, the RFC's responsibilities were centred on support of the British Army, via artillery co-operation and photographic reconnaissance...

 – this allowed the gun to slide backward for drum changing, and also to be fired at an upward angle, a very effective way of attacking an enemy from the "blind spot" under his tail. This type of mounting was still only possible for a biplane with a top wing positioned near the apex of the propeller's arc – it put considerable strain on the fragile wing structures of the period, and it was less rigid than a gun mounting on the fuselage, producing a greater "scatter" of bullets, especially at anything but very short range.

The earliest versions of the Bristol Scout
Bristol Scout
The Bristol Scout was a simple, single seat, rotary-engined biplane originally intended as a civilian racing aircraft. Like other similar fast, light aircraft of the period - it was acquired by the RNAS and the RFC as a "scout", or fast reconnaissance type...

 to see aerial combat duty in 1915, the Scout C, had Lewis gun mounts in RNAS service that sometimes were elevated above the propeller arc, and sometimes (in an apparently reckless manner) firing directly through the propeller arc without synchronisation. Captain Lanoe Hawker
Lanoe Hawker
Lanoe George Hawker VC, DSO was a British flying ace, with seven credited victories, during the First World War. He was the first British flying ace, and the third pilot to receive the Victoria Cross, the highest and most prestigious award for gallantry in the face of the enemy that can be awarded...

 of the Royal Flying Corps, however, had mounted his Lewis gun just forward of the cockpit to fire forwards and outwards, on the left side of his aircraft's fuselage at about a 30º angle, on his Scout C, with serial number 1611, and with this aircraft on 25 July 1915, managed to defeat three German two seat observation aircraft to earn the first Victoria Cross
Victoria Cross
The Victoria Cross is the highest military decoration awarded for valour "in the face of the enemy" to members of the armed forces of various Commonwealth countries, and previous British Empire territories....

 awarded to a British aviator.

1915: The Fokker Scourge

The first purpose-designed fighter aircraft
Fighter aircraft
A fighter aircraft is a military aircraft designed primarily for air-to-air combat with other aircraft, as opposed to a bomber, which is designed primarily to attack ground targets...

 included the British Vickers F.B.5
Vickers F.B.5
The Vickers F.B.5 was a British two-seat pusher military biplane of the First World War...

 – machine gun armament was also fitted to several French types, such as the Morane-Saulnier L and N. Initially the German Air Service lagged behind the Allies in this respect, but this was soon to change dramatically.

In July 1915 the Fokker E.I
Fokker E.I
|-See also:-References:NotesBibliography* Boyne, Walter J. The Smithsonian Book of Flight for Young People. Washington, DC: Smithsonian Institution, 1988. ISBN 0-689-31422-1....

 became operational – this was the first type of aircraft to enter service with a "synchronisation gear
Interrupter gear
An interrupter gear is a device used on military aircraft and warships in order to allow them to target opponents without damaging themselves....

" (often referred to mistakenly as an "interrupter gear"), which enabled a machine gun to fire through the arc of the propeller without striking its blades. This constituted an important advantage over other contemporary fighter aircraft. This aircraft and its immediate successors – also commonly known as the Eindecker
Fokker Eindecker
The Fokker Eindecker was a German World War I monoplane single-seat fighter aircraft designed by Dutch engineer Anthony Fokker. Developed in April 1915, the Eindecker was the first purpose-built German fighter aircraft and the first aircraft to be fitted with synchronizer gear, enabling the pilot...

(German for "Monoplane
Monoplane
A monoplane is a fixed-wing aircraft with one main set of wing surfaces, in contrast to a biplane or triplane. Since the late 1930s it has been the most common form for a fixed wing aircraft.-Types of monoplane:...

") – for the first time supplied an effective equivalent to Allied fighters.

The very first successful engagement involving a synchronized-gun-armed aircraft occurred on July 1, 1915, just to the east of Lunéville
Lunéville
Lunéville is a commune in the Meurthe-et-Moselle department in France.It is a sub-prefecture of the department and lies on the Meurthe River.-History:...

, France when Leutnant Kurt Wintgens
Kurt Wintgens
Leutnant Kurt Wintgens was a German World War I fighter ace. He was the first military fighter pilot to score a victory over an opposing aircraft in an aircraft armed with a synchronized machine gun. Wintgens was the recipient of the Iron Cross and the Blue Max.-Background:Wintgens was born into a...

, one of the pilots selected by Fokker to demonstrate the small series of five Eindecker prototype aircraft, forced down a French Morane-Saulnier Type L
Morane-Saulnier Type L
-Bibliography:* Bruce, J.M. The Aeroplanes of the Royal Flying Corps . London:Putnam, 1982. ISBN 0 370 30084 x.* Green, William and Swanborough, Gordon. The Complete Book of Fighters. New York: Smithmark, 1994. ISBN 0-8317-3939-8....

 "Parasol" two seat observation monoplane behind Allied lines with his Fokker M.5K/MG Eindecker production prototype aircraft, carrying the IdFlieg
Idflieg
The Idflieg was the bureau of the German War Office that oversaw German military aviation prior to and during World War I....

 military serial number "E.5/15". Some 200 shots from Wintgens' aircraft had hit the Gnôme Lambda rotary engine
Rotary engine
The rotary engine was an early type of internal-combustion engine, usually designed with an odd number of cylinders per row in a radial configuration, in which the crankshaft remained stationary and the entire cylinder block rotated around it...

 of the Morane Parasol, forcing it to land safely in Allied territory.

By late 1915 the Germans had achieved air superiority, making Allied access to vital intelligence derived from continual aerial reconnaissance more dangerous to acquire. In particular the essential defencelessness of Allied reconnaissance types was exposed. The first German "ace"
Fighter Ace
Fighter Ace was a massively multiplayer online computer game in which one flies World War II fighter and bomber planes in combat against other players and virtual pilots...

 pilots – notably Max Immelmann
Max Immelmann
Max Immelmann was the first German World War I flying ace. He was a great pioneer in fighter aviation and is often mistakenly credited with the first aerial victory using a synchronized gun...

 – had begun their careers.

The number of actual Allied casualties involved was for various reasons very small compared with the intensive air fighting of 1917–18. The deployment of the Eindeckers was less than overwhelming – the new type was issued in ones and twos to existing reconnaissance squadrons – and it was to be nearly a year before the Germans were to follow the British in establishing specialist fighter squadrons. The Eindecker was also, in spite of its advanced armament, by no means an outstanding aircraft, being closely based on a pre-war French racer.

Nonetheless, the morale impact of the fact that the Germans were fighting back in the air, and effectively too, created a major scandal in the British parliament and press. The ascendency of the Eindecker also contributed to the surprise the Germans were able to achieve at the start of the Battle of Verdun
Battle of Verdun
The Battle of Verdun was one of the major battles during the First World War on the Western Front. It was fought between the German and French armies, from 21 February – 18 December 1916, on hilly terrain north of the city of Verdun-sur-Meuse in north-eastern France...

 – the French reconnaissance aircraft failed to provide their usual cover of the German positions.

Fortunately for the Allies, two new British fighters were already in production that were a match for the Fokker—the F.E.2b
Royal Aircraft Factory F.E.2
The Royal Aircraft Factory F.E.2 was a two-seat pusher biplane that was operated as a day and night bomber and as a fighter aircraft by the Royal Flying Corps during the First World War...

 and the D.H.2
Airco DH.2
|-DH.2 aces:Distinguished pilots of the DH.2 included Victoria Cross winner Lanoe Hawker , who was the first commander of No 24 Squadron and ace Alan Wilkinson. The commander of No. 32 Squadron, Lionel Rees won the Victoria Cross flying the D.H.2 for single handedly attacking a formation of 10...

. These were both "pushers
Pusher configuration
In a craft with a pusher configuration the propeller are mounted behind their respective engine. According to Bill Gunston, a "pusher propeller" is one mounted behind engine so that drive shaft is in compression...

" and could fire forwards without gun synchronisation. The F.E.2b reached the front in September 1915, and the D.H.2 in the following February. On the French front, the tiny Nieuport 11
Nieuport 11
|-See also:-References:NotesBibliography* Angelucci, Enzio, ed. The Rand McNally Encyclopedia of Military Aircraft. New York: The Military Press, 1983. ISBN 0-517-41021-4....

, a tractor
Tractor configuration
thumb|right|[[Evektor-Aerotechnik|Aerotechnik EV97A Eurostar]], a tractor configuration aircraft, being pulled into position by its pilot for refuelling....

 biplane with a forward firing gun mounted outside the arc of the propeller (on the top wing) also proved more than a match for the German fighter when it entered service in January 1916. With these new types the Allies re-established air superiority in time for the Battle of the Somme, and the "Fokker Scourge" was over.

The Fokker E-III, Airco DH-2, and Nieuport 11 would be the very first in a long line of single seat fighter aircraft
Fighter aircraft
A fighter aircraft is a military aircraft designed primarily for air-to-air combat with other aircraft, as opposed to a bomber, which is designed primarily to attack ground targets...

 used by both sides during the war. Very quickly it became clear the primary role of fighters would be attacking enemy two-seaters, which were becoming increasingly important as sources of reconnaissance
Reconnaissance
Reconnaissance is the military term for exploring beyond the area occupied by friendly forces to gain information about enemy forces or features of the environment....

 and artillery observation
Artillery observer
A military artillery observer or spotter is responsible for directing artillery fire and close air support onto enemy positions. Because artillery is an indirect fire weapon system, the guns are rarely in line-of-sight of their target, often located tens of miles away...

, while also escorting and defending friendly two-seaters from enemy fighters. Fighters were also used to attack enemy observation balloon
Observation balloon
Observation balloons are balloons that are employed as aerial platforms for intelligence gathering and artillery spotting. Their use began during the French Revolutionary Wars, reaching their zenith during World War I, and they continue in limited use today....

s, strafe enemy ground targets, and defend friendly airspace from enemy bomber
Bomber
A bomber is a military aircraft designed to attack ground and sea targets, by dropping bombs on them, or – in recent years – by launching cruise missiles at them.-Classifications of bombers:...

s.

1916: Verdun and the Somme

When the battle of Verdun began on the 21 February 1916 German air superiority initially enabled the Germans to establish a blockade on the French air squadrons called luftsperre. However the French were already arming their specialist fighter squadrons, the Escadrilles de chasse, with the Nieuport 11
Nieuport 11
|-See also:-References:NotesBibliography* Angelucci, Enzio, ed. The Rand McNally Encyclopedia of Military Aircraft. New York: The Military Press, 1983. ISBN 0-517-41021-4....

 and with a new offensive strategy they quickly overcame the luftsperre, establishing air superiority over the battle by April.

In the meantime, in the aftermath of the Fokker Scourge, the need for a larger, better equipped RFC became obvious, and the process of raising many new British squadrons was started. In the short term creating new units was easier than producing aircraft to equip them, and training pilots to man them. When the Battle of the Somme started in July 1916 most ordinary RFC squadrons were still equipped with the BE.2c
Royal Aircraft Factory BE.2
The Royal Aircraft Factory B.E.2 was a British single-engine two-seat biplane which was in service with the Royal Flying Corps from 1912 until the end of World War I. The "Bleriot" in its designation refers to the fact that, like the Bleriot types it was of tractor configuration, with the...

 – the same aircraft that had proved such an easy target for the Fokker Eindecker. New types such as the Sopwith 1½ Strutter
Sopwith 1½ Strutter
The Sopwith 1½ Strutter was a British one or two-seat biplane multi-role aircraft of the First World War. It is significant as the first British-designed two seater tractor fighter, and the first British aircraft to enter service with a synchronised machine gun...

 had to be transferred from production intended for the RNAS. Even more seriously, replacement pilots were being sent to France with pitifully few flying hours.

As the German military aviation service, then known as the Fliegertruppe before October 1916, found that the Eindecker had now been checked by the new Allied biplanes, both of pusher (D.H.2, F.E. 2b and the Royal Aircraft Factory F.E.8
Royal Aircraft Factory F.E.8
|-See also:-References:NotesBibliography* Bruce, J.M. The Aeroplanes of the Royal Flying Corps . London: Putnam, 1982. ISBN 0-370-30084-X.* Bruce, J.M. British Aeroplanes 1914–18. London: Putnam, 1957....

) and tractor (Nieuport 11 and Bristol Scout
Bristol Scout
The Bristol Scout was a simple, single seat, rotary-engined biplane originally intended as a civilian racing aircraft. Like other similar fast, light aircraft of the period - it was acquired by the RNAS and the RFC as a "scout", or fast reconnaissance type...

) configuration, they sanctioned the development of similar fighter biplanes to replace the now-obsolete Eindecker. The first German fighter biplanes in service were the Halberstadt D.II
Halberstadt D.II
The Halberstadt D.II was a biplane fighter aircraft of the Luftstreitkräfte that served through the period of Allied air superiority in early 1916, but had begun to be superseded in the Jagdstaffeln by the superior Albatros fighters by the autumn of that year.-Design and development:The D.II was...

, the Fokker D.I
Fokker D.I
|-See also:-Bibliography:*Gray, Peter and Thetford, Owen. German Aircraft since the First World War. London:Putnam, 1962.*Green William and Swanborough, Gordon. The Complete Book of Fighters. New York: Smithmark, 1994. ISBN 0-8317-3939-8....

, D.II and D.III
Fokker D.III
-Bibliography:* Gray, Peter and Owen Thetford. German Aircraft of the First World War. London: Putnam, 1962. ISBN 0-93385-271-1*Green, William and Gordon Swanborough. The Complete Book of Fighters. New York: Smithmark, 1994. ISBN 0-8317-3939-8....

, each armed with one synchronized lMG 08 machine gun, and the earliest examples of Robert Thelen's streamlined Albatros D.I
Albatros D.I
|-See also:...

 fighter, the first German fighter design to carry a pair of the dreaded lMG 08 Spandau machine guns in a forward-firing, synchronized mount.

Nonetheless, air superiority and an "offensive" strategy facilitated the greatly increased involvement of the RFC in the battle itself, in what was known at the time as "trench strafing" – in modern terms close support
Close air support
In military tactics, close air support is defined as air action by fixed or rotary winged aircraft against hostile targets that are close to friendly forces, and which requires detailed integration of each air mission with fire and movement of these forces.The determining factor for CAS is...

. For the rest of the war this became a regular routine, with both the attacking and defending infantry in a land battle being constantly liable to attack by machine guns and light bombs from the air. At this time, counter fire from the ground was far less effective than it became later, when the necessary techniques of deflection shooting had been mastered.

Allied air superiority was maintained during the both battles, and the increased effectiveness of Allied air activity proved disturbing to the German High Command. A complete reorganisation of the German Luftstreitkräfte followed. This reorganisation eventually produced the German strategic bombing squadrons that were to produce such consternation in England in 1917 and 1918, and the specialist close support squadrons (Schlachtstaffeln) that gave the British infantry such trouble at Cambrai and during the German Spring offensive
Spring Offensive
The 1918 Spring Offensive or Kaiserschlacht , also known as the Ludendorff Offensive, was a series of German attacks along the Western Front during World War I, beginning on 21 March 1918, which marked the deepest advances by either side since 1914...

 of 1918. Its most famous and dramatic effect, however, involved the raising of specialist fighter squadrons or Jagdstaffeln - a full year after similar units had become part of the RFC and the French Aéronautique Militaire. Initially these units were equipped with the previously mentioned Fokker and Halberstadt types, but by the end of 1916 increasing numbers of the new Albatros
Albatros D.I
|-See also:...

 fighters were well on the way to establishing the German air superiority that was to mark the first half of 1917.

1917: Bloody April

The first half of 1917 was a successful period for the jagdstaffeln and the much larger RFC suffered significantly higher casualties than their opponents. While new Allied fighters such as the Sopwith Pup
Sopwith Pup
The Sopwith Pup was a British single seater biplane fighter aircraft built by the Sopwith Aviation Company. It entered service with the Royal Flying Corps and the Royal Naval Air Service in the autumn of 1916. With pleasant flying characteristics and good maneuverability, the aircraft proved very...

, Sopwith Triplane
Sopwith Triplane
The Sopwith Triplane was a British single seat fighter aircraft designed and manufactured by the Sopwith Aviation Company during the First World War. Pilots nicknamed it the Tripehound or simply the Tripe. The Triplane became operational with the Royal Naval Air Service in early 1917 and was...

, and SPAD S.VII
SPAD S.VII
The SPAD S.VII was the first of a series of highly successful biplane fighter aircraft produced by Société Pour L'Aviation et ses Dérivés during the First World War. Like its successors, the S.VII was renowned as a sturdy and rugged aircraft with good climbing and diving characteristics...

 were coming into service, at this stage their numbers were small. On the other hand, the jagdstaffeln were equipped with the new Albatros D.III
Albatros D.III
The Albatros D.III was a biplane fighter aircraft used by the Imperial German Army Air Service and the Austro-Hungarian Air Service during World War I. The D.III was flown by many top German aces, including Manfred von Richthofen, Ernst Udet, Erich Löwenhardt, Kurt Wolff, and Karl Emil Schäfer...

, which was, in spite of some structural difficulties, "the best fighting scout on the Western Front" at the time. Meanwhile, most RFC two-seater squadrons still flew the BE.2
Royal Aircraft Factory BE.2
The Royal Aircraft Factory B.E.2 was a British single-engine two-seat biplane which was in service with the Royal Flying Corps from 1912 until the end of World War I. The "Bleriot" in its designation refers to the fact that, like the Bleriot types it was of tractor configuration, with the...

e, a very minor improvement on the BE.2c, and fundamentally unsuited to air-toair combat.

This culminated in the rout of April 1917, known as "Bloody April
Bloody April
During the First World War, the month of April 1917 was known as Bloody April by the Royal Flying Corps . The RFC suffered particularly severe losses — about three times as many as the Imperial German Army Air Service over the same period — but continued its primary role in support of the ground...

". The RFC suffered particularly severe losses, although Trenchard's
Hugh Trenchard as commander of the Royal Flying Corps in France
Hugh Trenchard was the commander of the Royal Flying Corps in France from 25 August 1915 until 2 January 1918.-Appointment and style of command:...

 policy of "offensive patrol", placing most of their flying on the German side of the lines, was maintained.

During the last half of 1917, the British Sopwith Camel
Sopwith Camel
The Sopwith Camel was a British First World War single-seat biplane fighter introduced on the Western Front in 1917. Manufactured by Sopwith Aviation Company, it had a short-coupled fuselage, heavy, powerful rotary engine, and concentrated fire from twin synchronized machine guns. Though difficult...

 and S.E.5a
Royal Aircraft Factory S.E.5
The Royal Aircraft Factory S.E.5 was a British biplane fighter aircraft of the First World War. Although the first examples reached the Western Front before the Sopwith Camel and it had a much better overall performance, problems with its Hispano-Suiza engine, particularly the geared-output H-S...

 and the French SPAD S.XIII
SPAD S.XIII
|-See also:-Bibliography:* Bruce, J.M. The Aeroplanes of the Royal Flying Corps . London: Putnam, 1982. ISBN 0-370-30084-X.* Sharpe, Michael. Biplanes, Triplanes, and Seaplanes. London: Friedman/Fairfax Books, 2000. ISBN 1-58663-300-7....

 became available in numbers. The ordinary two seater squadrons in the RFC received the R.E.8
Royal Aircraft Factory R.E.8
The Royal Aircraft Factory R.E.8 was a British two-seat biplane reconnaissance and bomber aircraft of the First World War designed by John Kenworthy. Intended as a replacement for the vulnerable B.E.2, the R.E.8 was more difficult to fly, and was regarded with great suspicion at first in the Royal...

 or the F.K.8
Armstrong Whitworth F.K.8
The Armstrong Whitworth F.K.8 was a British two-seat general-purpose biplane built by Armstrong Whitworth during the First World War. The type served alongside the better known R.E.8 until the end of the war, at which point 694 F.K.8s remained on RAF charge....

, not outstanding warplanes, but far less vulnerable than the BE.2e they replaced. The F.E.2d at last received a worthy replacement in the Bristol F.2b. On the other hand the latest Albatros, the D.V
Albatros D.V
|-See also:-Bibliography:*Bennett, Leon. Gunning for the Red Baron. College Station, TX: Texas A&M University Press, 2006. ISBN 1-58544-507-X....

 proved to be a disappointment, as was the Pfalz D.III
Pfalz D.III
|-See also:-Bibliography:* Gray, Peter and Owen Thetford. German Aircraft of the First World War. London: Putnam, 1962. ISBN 0-93385-271-1.* Grosz, Peter M. Pfalz D.IIIa . Berkhamsted, Herts, UK: Albatros Publications, 1995. ISBN 0-94841-425-1.* Guttman, Jon. Balloon-Busting Aces of World War 1 ...

. The exotic Fokker Dr.I
Fokker Dr.I
The Fokker Dr.I Dreidecker was a World War I fighter aircraft built by Fokker-Flugzeugwerke. The Dr.I saw widespread service in the spring of 1918...

 was plagued, like the Albatros, with structural problems. By the end of the year the air superiority pendulum had swung once more in the Allies' favour.

Up to 1918: the final year of war

The final year of the war (1918) saw increasing shortages of supplies on the side of the Central Powers. Captured Allied aircraft were scrounged for every available material, even to the point of draining the lubricants from damaged engines just to keep one more German aircraft flyable.

Manfred von Richthofen
Manfred von Richthofen
Manfred Albrecht Freiherr von Richthofen , also widely known as the Red Baron, was a German fighter pilot with the Imperial German Army Air Service during World War I...

, the famed Red Baron credited with 80 victories, was killed in April, probably by an Australian anti-aircraft machinegunner (although Royal Air Force pilot Captain Arthur Roy Brown
Roy Brown (pilot)
Captain Arthur Roy Brown DSC and bar RNAS was a Canadian World War I flying ace. The Royal Air Force officially credited Brown with shooting down Manfred von Richthofen, the "Red Baron", although it is in fact unlikely that Brown fired the bullet that caused his death...

 was officially credited), and the leadership of Jagdgeschwader 1
Jagdgeschwader 1 (World War 1)
The Jagdgeschwader 1 of World War I, was a fighter unit comprising four Jastas or 'fighter squadrons', originally raised by combining Jastas 4, 6, 10 and 11, on 24 June 1917 with Manfred von Richthofen as commodore...

 eventually passed to Hermann Göring
Hermann Göring
Hermann Wilhelm Göring, was a German politician, military leader, and a leading member of the Nazi Party. He was a veteran of World War I as an ace fighter pilot, and a recipient of the coveted Pour le Mérite, also known as "The Blue Max"...

.

Germany introduced the Fokker D.VII
Fokker D.VII
The Fokker D.VII was a German World War I fighter aircraft designed by Reinhold Platz of the Fokker-Flugzeugwerke. Germany produced around 3,300 D.VII aircraft in the summer and autumn of 1918. In service, the D.VII quickly proved itself to be a formidable aircraft...

, both loved and loathed to the point that the surrender of all surviving examples was specifically ordered by the victorious Allies.

This year also saw the United States increasingly involved. While American volunteers had been flying in Allied squadrons since the early years of the war, not until 1918 did all-American squadrons begin patrolling the skies above the trenches. At first, the Americans were largely supplied with second-rate weapons and obsolete aircraft, such as the Nieuport 28
Nieuport 28
|-See also:-Bibliography:* Cheesman E.F. Fighter Aircraft of the 1914-1918 War. Letchworth, UK: Harleyford Publications, 1960, pp. 98–99....

. As American numbers grew, equipment improved, including the SPAD S.XIII
SPAD S.XIII
|-See also:-Bibliography:* Bruce, J.M. The Aeroplanes of the Royal Flying Corps . London: Putnam, 1982. ISBN 0-370-30084-X.* Sharpe, Michael. Biplanes, Triplanes, and Seaplanes. London: Friedman/Fairfax Books, 2000. ISBN 1-58663-300-7....

, one of the best French aircraft in the war.

Impact

By the war's end, the impact of air missions on the ground war was in retrospect mainly tactical – strategic bombing, in particular, was still very rudimentary indeed. This was partly due to its restricted funding and use, as it was, after all, a new technology. On the other hand the effect of artillery, which had perhaps the greatest effect of any military arm in this war, was very much affected by the availability of aerial photography and aerial "spotting". By 1917 weather bad enough to restrict flying was considered as "putting the gunner's eyes out".

Some, such as then-Brigadier General William "Billy" Mitchell, commander of all American air combat units in France, claimed "the only damage that has come to [Germany] has been through the air". Mitchell was famously controversial in his view that the future of war was not on the ground or at sea, but in the air:

Anti-aircraft weaponry

Though aircraft still functioned as vehicles of observation, increasingly it was used as a weapon in itself. Dog fights erupted in the skies over the front lines – aircraft went down in flames and heroes were born. From this air-to-air combat, the need grew for better aircraft and gun armament. Aside from machineguns, air-to-air rocket
Air-to-air rocket
An air-to-air rocket or air interception rocket is an unguided projectile fired from aircraft to engage other flying targets. They were used briefly in World War I to engage enemy observation balloons and in and after World War II to engage enemy bombers...

s were also used, such as the Le Prieur rocket
Le Prieur rocket
Le Prieur rockets were a type of incendiary air-to-air rockets used in World War I against observation balloons and airships. They were invented by the French Lieutenant Yves Le Prieur and were first used in the Battle of Verdun on 1916...

 against balloons and airships. Recoilless rifle
Recoilless rifle
A recoilless rifle or recoilless gun is a lightweight weapon that fires a heavier projectile than would be practical to fire from a recoiling weapon of comparable size. Technically, only devices that use a rifled barrel are recoilless rifles. Smoothbore variants are recoilless guns...

s and autocannon
Autocannon
An autocannon or automatic cannon is a rapid-fire projectile weapon firing a shell as opposed to the bullet fired by a machine gun. Autocannons often have a larger caliber than a machine gun . Usually, autocannons are smaller than a field gun or other artillery, and are mechanically loaded for a...

s were also attempted but they pushed early fighters to unsafe limits while bringing negligible returns. Another innovation was air-to-air bombing if a fighter had been fortunate enough to climb higher than an airship. The Ranken dart
Ranken dart
A Ranken dart was an air-dropped weapon developed during World War I for the purpose of destroying or damaging the German Zeppelins which were attacking Britain at the time. It was a 1lb explosive missile-shaped flechette-type of bomb which was commonly carried in packs of 24 and could be...

 was designed just for this opportunity.

This need for improvement was not limited to air-to-air combat. On the ground, methods developed before the war were being used to deter enemy aircraft from observation and bombing. Anti-aircraft artillery rounds were fired into the air and exploded into clouds of smoke and fragmentation
Fragmentation (weaponry)
Fragmentation is the process by which the casing of an artillery shell, bomb, grenade, etc. is shattered by the detonating high explosive filling. The correct technical terminology for these casing pieces is fragments , although shards or splinters can be used for non-preformed fragments...

, called archie by the British.

Anti-aircraft artillery defenses were increasingly used around observation balloons, which became frequent targets of enemy fighters equipped with special incendiary
Incendiary ammunition
-World War I:One of the first uses of incendiary ammunition occurred in World War I. At the time, phosphorus—the primary ingredient in the incendiary charge—ignited upon firing, leaving a trail of blue smoke. They were also known as 'smoke tracer' for this reason. The effective range of...

 bullets. Because balloons were so flammable, due to the hydrogen
Hydrogen
Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly...

 used to inflate
Inflate
Inflation commonly refers to a rise in the general price level over a period of time .Inflation may also refer to:...

 them, observers were given parachutes, enabling them to jump to safety. Ironically, only a few aircrew had this option, due in part to a mistaken belief they inhibited aggressiveness, and in part to their significant weight.

Bombing and reconnaissance

As the stalemate developed on the ground, with both sides unable to advance even a few hundred yards without a major battle and thousands of casualties, aircraft became greatly valued for their role gathering intelligence on enemy positions and bombing the enemy's supplies behind the trench lines. Large aircraft with a pilot and an observer were used to scout enemy positions and bomb their supply bases. Because they were large and slow, these aircraft made easy targets for enemy fighter aircraft. As a result, both sides used fighter aircraft to both attack the enemy's two-seat aircraft and protect their own while carrying out their missions.

While the two-seat bombers and reconnaissance aircraft were slow and vulnerable, they were not defenseless. Two-seaters had the advantage of both forward- and rearward-firing guns. Typically, the pilot controlled fixed guns behind the propeller, similar to guns in a fighter aircraft, while the observer controlled one with which he could cover the arc behind the aircraft. A tactic used by enemy fighter aircraft to avoid fire from the rear gunner was to attack from slightly below the rear of two-seaters, as the tail gunner was unable to fire below the aircraft. However, two-seaters could counter this tactic by going into a dive at high speeds, aided by their heavy weight. Pursuing a diving two-seater was hazardous for a fighter pilot, as it would place the fighter directly in the rear gunner's line of fire; several high scoring aces of the war were shot down by "lowly" two-seaters, including Raoul Lufbery
Raoul Lufbery
Gervais Raoul Lufbery was aFrench-American fighter pilot and flying ace in World War I. Because he served in both French aviation, and later the United States Army Air Service in World War I, he is sometimes listed as a French ace and sometimes as an American ace, though all but one of his 17...

, Erwin Böhme
Erwin Böhme
Erwin Böhme , Pour le Mérite, was a German pilot during World War I. He was born in Holzminden, grew into an athletic sportsman, and became a flying ace during the war credited with 24 victories. He was a both a close friend and a military subordinate of Oswald Boelcke and was inadvertently...

, and Robert Little.

Strategic bombing

The first ever aerial bombardment of civilians was during World War I. On 19 January 1915, two German Zeppelin
Zeppelin
A Zeppelin is a type of rigid airship pioneered by the German Count Ferdinand von Zeppelin in the early 20th century. It was based on designs he had outlined in 1874 and detailed in 1893. His plans were reviewed by committee in 1894 and patented in the United States on 14 March 1899...

s dropped 24 50 kilograms (110.2 lb) high-explosive bombs and ineffective three-kilogram incendiaries on Great Yarmouth
Great Yarmouth
Great Yarmouth, often known to locals as Yarmouth, is a coastal town in Norfolk, England. It is at the mouth of the River Yare, east of Norwich.It has been a seaside resort since 1760, and is the gateway from the Norfolk Broads to the sea...

, Sheringham
Sheringham
Sheringham is a seaside town in Norfolk, England, west of Cromer.The motto of the town, granted in 1953 to the Sheringham Urban District Council, is Mare Ditat Pinusque Decorat, Latin for "The sea enriches and the pine adorns"....

, King's Lynn
King's Lynn
King's Lynn is a sea port and market town in the ceremonial county of Norfolk in the East of England. It is situated north of London and west of Norwich. The population of the town is 42,800....

, and the surrounding villages. In all, four people were killed, sixteen injured, and monetary damage was estimated at £7,740, although the public and media reaction were out of proportion to the death toll.

There were a further nineteen raids in 1915, in which 37 tons of bombs were dropped, killing 181 people and injuring 455. Raids continued in 1916. London was accidentally bombed in May, and, in July, the Kaiser
Kaiser
Kaiser is the German title meaning "Emperor", with Kaiserin being the female equivalent, "Empress". Like the Russian Czar it is directly derived from the Latin Emperors' title of Caesar, which in turn is derived from the personal name of a branch of the gens Julia, to which Gaius Julius Caesar,...

 allowed directed raids against urban centres. There were 23 airship raids in 1916 in which 125 tons of ordnance were dropped, killing 293 people and injuring 691. Gradually British air defenses improved. In 1917 and 1918 there were only eleven Zeppelin raids against England, and the final raid occurred on 5 August 1918, which resulted in the death of KK Peter Strasser
Peter Strasser
Peter Strasser was chief commander of German Imperial Navy Zeppelins during World War I, the main force operating bombing campaigns from 1915 to 1917. He was killed when flying the war's last airship raid over Great Britain....

, commander of the German Naval Airship Department. By the end of the war, 51 raids had been undertaken, in which 5,806 bombs were dropped, killing 557 people and injuring 1,358.

The Zeppelin raids were complemented by the Gotha G
Gotha G
|-See also:-References:* The Complete Encyclopedia of Flight 1848-1939 by John Batchelor and Malcolm V. Lowe-External links:*...

 bombers from 1917, which were the first heavier than air bombers to be used for strategic bombing
Strategic bombing
Strategic bombing is a military strategy used in a total war with the goal of defeating an enemy nation-state by destroying its economic ability and public will to wage war rather than destroying its land or naval forces...

, and by a small force of five Zeppelin-Staaken R.VI "giant" four engined bombers from late September 1917 through to mid-May 1918. Twenty-eight Gotha twin-engined bombers were lost on the raids over England, with no losses for the Zeppelin-Staaken giants. It has been argued that the raids were effective far beyond material damage in diverting and hampering wartime production, and diverting twelve squadrons and over 10,000 men to air defenses. Calculations performed on the number of dead to the weight of bombs dropped had a profound effect on attitudes of the British government and population in the interwar years, who believed that "The bomber will always get through
The bomber will always get through
The bomber will always get through was a phrase used by Stanley Baldwin in 1932, in the speech "A Fear for the Future" to the British Parliament...

".

Observation balloons

Manned observation balloons floating high above the trenches were used as stationary reconnaissance points on the front lines, reporting enemy troop positions and directing artillery fire. Balloons commonly had a crew of two equipped with parachutes: upon an enemy air attack on the flammable balloon, the crew would parachute to safety. Recognized for their value as observer platforms, observation balloons were important targets of enemy aircraft. To defend against air attack, they were heavily protected by large concentrations of antiaircraft guns and patrolled by friendly aircraft. Blimps and balloons helped contribute to the stalemate of the trench warfare of World War I, and contributed to air to air combat for air superiority because of their significant reconnaissance value.
To encourage pilots to attack enemy balloons, both sides counted downing an enemy balloon as an "air-to-air" kill, with the same value as shooting down an enemy aircraft. Some pilots, known as balloon buster
Balloon buster
Balloon busters were military pilots known for destroying enemy observation balloons. These pilots were noted for their fearlessness. Seventy-six fighter pilots in World War I were each credited with destroying five or more balloons, and thus were balloon aces....

s, became particularly distinguished by their prowess at shooting down enemy balloons. Perhaps the best known of these was American ace Frank Luke
Frank Luke
Frank Luke Jr. was an American fighter ace, ranking second among U.S. Army Air Service pilots after Captain Eddie Rickenbacker in number of aerial victories during World War I . Frank Luke was the first airman to receive the Medal of Honor...

: 14 of his 18 kills were enemy balloons.

Leading aces

As pioneer aviators invented air to air combat, the contending sides developed various methods of tracking aerial casualties and victories. Aviators with five or more aerial victories confirmed by their parent air service were dubbed "aces". Their numbers would burgeon, until by war's end, there were over 1,800 aces.

The following aces scored the most victories for their respective air services.
Name Air service Confirmed victories
Baracca, Francesco
Francesco Baracca
Count Francesco Baracca was Italy's top fighter ace of World War I. He was credited with 34 aerial victories.-Before World War I:...

Corpo Aeronautico Militare 34
Bishop, William Avery
Billy Bishop
Air Marshal William Avery "Billy" Bishop VC, CB, DSO & Bar, MC, DFC, ED was a Canadian First World War flying ace, officially credited with 72 victories, making him the top Canadian ace, and according to some sources, the top ace of the British Empire.-Early life:Bishop was born in Owen Sound,...

Royal Air Force
Royal Air Force
The Royal Air Force is the aerial warfare service branch of the British Armed Forces. Formed on 1 April 1918, it is the oldest independent air force in the world...

72
Brumowski, Godwin
Godwin Brumowski
Godwin Brumowski was the most successful fighter ace of the Austro-Hungarian Air Force during World War I. He was officially credited with 35 air victories, with 8 others unconfirmed because they fell behind Allied lines...

Luftfahrtruppen 35
Cobby, Arthur Henry Australian Flying Corps 29
Coppens de Houthulst, Willy Omer
Willy Coppens
Willy Omer Francois Jean Coppens was Belgium's leading fighter ace and the champion "balloon buster" of World War I.-Background and Early Military Service:...

Belgian Military Aviation 37
Fonck, René
René Fonck
René Paul Fonck was a French aviator who ended the First World War as the top Allied fighter ace, and when all succeeding aerial conflicts of the 20th and 21st centuries are also considered, Fonck still holds the title of "all-time Allied Ace of Aces". He received confirmation for 75 victories ...

Aéronautique Militaire 75
Kazakov, Alexander Imperial Russian Air Force
Imperial Russian Air Force
The Imperial Russian Air Force existed in the Russian Empire between 1910 and 1917....

20
Richthofen, Manfred von
Manfred von Richthofen
Manfred Albrecht Freiherr von Richthofen , also widely known as the Red Baron, was a German fighter pilot with the Imperial German Army Air Service during World War I...

Luftstreitkräfte
Luftstreitkräfte
The Deutsche Luftstreitkräfte , known before October 1916 as Die Fliegertruppen des deutschen Kaiserreiches , or simply Die Fliegertruppen, was the air arm of the Imperial German Army during World War I...

80
Rickenbacker, Edward Vernon
Eddie Rickenbacker
Edward Vernon Rickenbacker was an American fighter ace in World War I and Medal of Honor recipient. He was also a race car driver and automotive designer, a government consultant in military matters and a pioneer in air transportation, particularly as the longtime head of Eastern Air Lines.-Early...

US Army Air Service
United States Army Air Service
The Air Service, United States Army was a forerunner of the United States Air Force during and after World War I. It was established as an independent but temporary wartime branch of the War Department by two executive orders of President Woodrow Wilson: on May 24, 1918, replacing the Aviation...

26

Pioneers of aerial warfare

The following aviators were the first to reach important milestones in the development of aerial combat during World War I:
Name Date Country Event
Pyotr Nesterov
Pyotr Nesterov
Pyotr Nikolayevich Nesterov was a Russian pilot, an aircraft technical designer and an aerobatics pioneer.-Life and career:The son of a military academy teacher, Pyotr Nesterov decided to choose a military career. In August 1904 he left the military school in Nizhny Novgorod and went to the...

25 August 1914 Russia Scored first air to air victory in history, by ramming an Austrian plane
Louis Quénault 5 October 1914 France First flier to use a machine gun in air to air combat to down a foe
Roland Garros 1 April 1915 France First pilot to score an aerial victory by firing through his airplane's propeller while simultaneously aiming both plane and gun
Adolphe Pégoud
Adolphe Pegoud
Adolphe Célestin Pégoud was a well known pre-war French aviator who became the first fighter ace.Pégoud served in the French Army from 1907 to 1913...

3 April 1915 France Became first flying ace in history
Kurt Wintgens
Kurt Wintgens
Leutnant Kurt Wintgens was a German World War I fighter ace. He was the first military fighter pilot to score a victory over an opposing aircraft in an aircraft armed with a synchronized machine gun. Wintgens was the recipient of the Iron Cross and the Blue Max.-Background:Wintgens was born into a...

1 July 1915 Germany First aerial victory using a machine gun sychronized to fire through a plane's propeller arc
Lanoe Hawker
Lanoe Hawker
Lanoe George Hawker VC, DSO was a British flying ace, with seven credited victories, during the First World War. He was the first British flying ace, and the third pilot to receive the Victoria Cross, the highest and most prestigious award for gallantry in the face of the enemy that can be awarded...

11 August 1915 Britain Became first British ace
Oswald Boelcke
Oswald Boelcke
Oswald Boelcke was a German flying ace of the First World War and one of the most influential patrol leaders and tacticians of the early years of air combat. Boelcke is considered the father of the German fighter air force, as well as the "Father of Air Fighting Tactics"; he was the first to...

16 October 1915 Germany Became first German ace
Otto Jindra
Otto Jindra
Hauptmann Otto Jindra was an Austro-Hungarian flying ace during World War I, credited with nine aerial victories while flying as an aerial observer. He doubled in excellence as a leader and administrator...

9 April 1916 Austro-Hungary Became first Austro-Hungarian ace
Redford Henry Mulock 21 May 1916 Canada Became first Canadian ace, as well as first ace of Royal Naval Air Service
Royal Naval Air Service
The Royal Naval Air Service or RNAS was the air arm of the Royal Navy until near the end of the First World War, when it merged with the British Army's Royal Flying Corps to form a new service , the Royal Air Force...

Eduard Pulpe
Eduard Pulpe
Lieutenant Eduard Martynovich Pulpe was a World War I flying ace credited with five aerial victories.Educated at Moscow University as a school teacher, Pulpe moved to France in 1912. After obtaining his civilian pilot's brevet no. 1571 on 19 December 1913, he volunteered for the French air service...

1 July 1916 Russia Became first ace of the Imperial Russian Air Force
Imperial Russian Air Force
The Imperial Russian Air Force existed in the Russian Empire between 1910 and 1917....

Roderic Dallas
Roderic Dallas
Roderic Stanley Dallas DSO, DSC & Bar was an Australian fighter ace of World War I. His score of aerial victories is generally regarded as the second-highest by an Australian, after Robert Little; however there is considerable dispute over Dallas's exact total...

9 July 1916 Australia Became first Australian ace
Frederick Libby
Frederick Libby
Frederick Libby was the first American ace of World War I, and of all time, achieved while serving as an observer in the Royal Flying Corps.-Early life and service:Frederick Libby was born on 15 July 1891 in Sterling, Colorado...

25 August 1916 United States of America Became first American ace
Mario Stoppani
Mario Stoppani
Sergente Mario Stoppani was a World War I flying ace credited with six aerial victories.-World War I:Stoppani was an auto mechanic before World War I. He enlisted in aviation in 1913, but was prevented from flight training until 1915. He scored his first aerial victory on 9 July 1916, sharing it...

31 October 1916 Italy Became first Italian ace
Fernand Jacquet
Fernand Jacquet
Captain-Commandant Fernand Maximillian Leon Jacquet was a World War I flying ace credited with seven aerial victories. He was the first Belgian pilot to score an aerial victory, on 17 April 1915, and became the first Belgian ace on 1 February 1917. He was also the first Belgian pilot to fly his...

1 February 1917 Belgium Became first Belgian ace
Maurice Benjamin
Maurice Benjamin
Captain Maurice Arthur Benjamin was a London born South African flying ace active during World War I. He was credited with eight aerial victories while serving as an observer/gunner in two-seater fighters.-Early life:...

27 April 1917 South Africa Became first South African ace
Thomas Culling
Thomas Culling
Flight Sub-Lieutenant Thomas Grey Culling was New Zealand's first World War I flying ace, and was credited with six aerial victories.Culling was assigned to fly Sopwith Triplane No. N5444 with 1 Naval Squadron after joining the Royal Naval Air Service in 1916. He began to score victories in Bloody...

19 May 1917 New Zealand Became first ace from New Zealand
Gottfried Freiherr von Banfield 2230 hours 31 May 1917 Austro-Hungary First Austro-Hungarian night victory; first in history.
Richard Burnard Munday
Richard Burnard Munday
Major Richard Burnard Munday was an English flying ace credited with scoring nine aerial victories during World War I. He was notable for scoring Britain's first night victory; he also excelled as a balloon buster at the rare feat of shooting down enemy observation balloons at night.-Early...

2200 hours 29 September 1917 Britain First British night victory, over an observation balloon
Observation balloon
Observation balloons are balloons that are employed as aerial platforms for intelligence gathering and artillery spotting. Their use began during the French Revolutionary Wars, reaching their zenith during World War I, and they continue in limited use today....

Fritz Anders
Fritz Anders
Leutnant Fritz G. Anders was a World War I flying ace credited with seven aerial victories. He was the world's first night fighter ace-References:...

2335 hours 20 August 1918 Germany First German night fighter victory, followed by another 15 minutes later; Anders became first night fighter ace in history

Notable aircraft


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