BL 5.5 inch Mark I naval gun
Encyclopedia
The Breech Loading 5.5 inch Mk I was a naval gun used by the British Royal Navy
Royal Navy
The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 during both World Wars.

Naval history

This weapon was developed by Coventry Ordnance Works
Coventry Ordnance Works
Coventry Ordnance Works was a British manufacturer of heavy guns, particularly naval artillery. The firm was based in the English city of Coventry.-History:...

 in 1913 and offered to the Greek Navy as main armament for two new cruisers building at Cammell Laird
Cammell Laird
Cammell Laird, one of the most famous names in British shipbuilding during the nineteenth and twentieth centuries, came about following the merger of Laird, Son & Co. of Birkenhead and Johnson Cammell & Co. of Sheffield at the turn of the twentieth century.- Founding of the business :The Company...

. On the outbreak Of 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...

 the two ships were purchased by Britain as HMS Chester
HMS Chester (1915)
HMS Chester was a Town class light cruiser of the Royal Navy, and one of two ships forming the Birkenhead subtype. Along with her sister ship, HMS Birkenhead, she was originally ordered for the Greek Navy in 1914 and was to be named Lambros Katsonis...

 and HMS Birkenhead
HMS Birkenhead (1915)
HMS Birkenhead was one of two Town class light cruisers originally ordered for the Greek Navy in 1914. She was to be named Antinavarchos Kountouriotis after Vice Admiral Pavlos Kountouriotis. The order was placed with Cammell Laird and production continued for the Greek account after the outbreak...

. The RN was happy with the performance of the gun as it was significantly lighter than the standard 6 inch gun and fired an 82 lb shell rather than the 100 lb shell of the 6 inch weapon. It therefore had a higher rate of fire with little loss in hitting power. The British ordered more guns as secondary armament for HMS Furious and HMS Hood. A total of 81 guns were made and were used on the following ships
  • HMS Chester
    HMS Chester (1915)
    HMS Chester was a Town class light cruiser of the Royal Navy, and one of two ships forming the Birkenhead subtype. Along with her sister ship, HMS Birkenhead, she was originally ordered for the Greek Navy in 1914 and was to be named Lambros Katsonis...

  • HMS Birkenhead
    HMS Birkenhead (1915)
    HMS Birkenhead was one of two Town class light cruisers originally ordered for the Greek Navy in 1914. She was to be named Antinavarchos Kountouriotis after Vice Admiral Pavlos Kountouriotis. The order was placed with Cammell Laird and production continued for the Greek account after the outbreak...

  • HMS Furious
    HMS Furious (47)
    HMS Furious was a modified cruiser built for the Royal Navy during the First World War. Designed to support the Baltic Project championed by the First Sea Lord of the Admiralty, Lord John Fisher, they were very lightly armoured and armed with only a few heavy guns. Furious was modified while...

  • HMS Hood
    HMS Hood (51)
    HMS Hood was the last battlecruiser built for the Royal Navy. One of four s ordered in mid-1916, her design—although drastically revised after the Battle of Jutland and improved while she was under construction—still had serious limitations. For this reason she was the only ship of her class to be...

  • HMS Hermes
    HMS Hermes (95)
    HMS Hermes was an aircraft carrier built for the Royal Navy. The ship was begun during World War I and finished after the war ended. She was the world's first ship to be designed and built as an aircraft carrier, although the Imperial Japanese Navy's was the first to be commissioned...



Guns removed from Chester, Birkenhead and Furious were used to arm Armed Merchant Cruisers
  • HMS Laurentic
    SS Laurentic (1927)
    The second SS Laurentic was an 18,724-ton ocean liner built in 1927 by Harland and Wolff, Belfast, for the White Star Line.She served the White Star Line from 1927 to 1936, undergoing two collisions during her career. The ship was then transformed into an auxiliary cruiser for the Royal Navy in the...

     - Armed Merchant cruiser
    Armed merchantmen
    Armed merchantman is a term that has come to mean a merchant ship equipped with guns, usually for defensive purposes, either by design or after the fact. In the days of sail, piracy and privateers, many merchantmen would be routinely armed, especially those engaging in long distance and high value...

  • HMS Montclare
    HMS Montclare (F85)
    Montclare was a passenger ship built by the John Brown and Company on Clydebank for the Canadian Pacific Steamship Company, Montreal. It was later purchased by the Royal Navy during World War II.- RMS Montclare :...

     - Armed Merchant cruiser

Coast defence gun

In 1940, the 5.5 inch guns were removed from HMS Hood
HMS Hood
Three ships of the Royal Navy have been named HMS Hood after several members of the Hood family, who were notable Navy officers: was a 91-gun second-rate ship of the line, originally laid down as HMS Edgar, but renamed in 1848 and launched in 1859. She was used for harbour service from 1872 and was...

 in a refit. Two were installed in Hood Battery on Ascension Island
Ascension Island
Ascension Island is an isolated volcanic island in the equatorial waters of the South Atlantic Ocean, around from the coast of Africa and from the coast of South America, which is roughly midway between the horn of South America and Africa...

 and remain there today. A pair were installed in specially built casemates on the roof of Coalhouse Fort
Coalhouse Fort
Coalhouse Fort is a large casemated fort in East Tilbury, near the modern town of Tilbury, in Thurrock, Essex, downstream from Tilbury Fort. It contains a museum of memorabilia from World War I and II.-History of the fort:...

 in Essex, overlooking the Thames Guns from the Hood also went to Bognor Regis
Bognor Regis
Bognor Regis is a seaside resort town and civil parish in the Arun district of West Sussex, on the south coast of England. It is south-south-west of London, west of Brighton, and south-east of the city of Chichester. Other nearby towns include Littlehampton east-north-east and Selsey to the...

, Pevensey
Pevensey
Pevensey is a village and civil parish in the Wealden district of East Sussex, England. The main village is located 5 miles north-east of Eastbourne, one mile inland from Pevensey Bay. The settlement of Pevensey Bay forms part of the parish.-Geography:The village of Pevensey is located on...

, North Foreland
North Foreland
North Foreland is a chalk headland on the Kent coast of southeast England.North Foreland forms the eastern end of the Isle of Thanet. It presents a bold cliff to the sea, and commands views over the southern North Sea.-Lighthouse:...

, Dover
Dover
Dover is a town and major ferry port in the home county of Kent, in South East England. It faces France across the narrowest part of the English Channel, and lies south-east of Canterbury; east of Kent's administrative capital Maidstone; and north-east along the coastline from Dungeness and Hastings...

 and Folkestone
Folkestone
Folkestone is the principal town in the Shepway District of Kent, England. Its original site was in a valley in the sea cliffs and it developed through fishing and its closeness to the Continent as a landing place and trading port. The coming of the railways, the building of a ferry port, and its...

.

Notable actions

Boy Seaman First Class Jack Cornwell was posthumously awarded the 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....

 for heroism in serving his gun on HMS Chester
HMS Chester (1915)
HMS Chester was a Town class light cruiser of the Royal Navy, and one of two ships forming the Birkenhead subtype. Along with her sister ship, HMS Birkenhead, she was originally ordered for the Greek Navy in 1914 and was to be named Lambros Katsonis...

 during the Battle of Jutland
Battle of Jutland
The Battle of Jutland was a naval battle between the British Royal Navy's Grand Fleet and the Imperial German Navy's High Seas Fleet during the First World War. The battle was fought on 31 May and 1 June 1916 in the North Sea near Jutland, Denmark. It was the largest naval battle and the only...

 on 31st May 1916.

Surviving examples

  • The gun served by Jack Cornwell VC is preserved in the Imperial War Museum
    Imperial War Museum
    Imperial War Museum is a British national museum organisation with branches at five locations in England, three of which are in London. The museum was founded during the First World War in 1917 and intended as a record of the war effort and sacrifice of Britain and her Empire...

     in London
  • Fort Bedford, Cross Hill, Ascension Island has two guns from HMS Hood
  • Fort Skansin, Tórshavn, Streymoy Island, Faroe Islands
    Tórshavn
    Tórshavn is the capital and largest town of the Faroe Islands. It is located in the southern part on the east coast of Streymoy. To the north west of the town lies the high mountain Húsareyn, and to the southwest, the high Kirkjubøreyn...

    , has two guns from HMS Furious : see :Image:British gun, skansin (Faroe Islands).jpg
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