Battle of Drina
Encyclopedia
The Battle of Drina was fought between Serbian and Austro-Hungarian armies in 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...

, in September 1914. The Austro-Hungarians engaged in a significant offensive over the Drina
Drina
The Drina is a 346 kilometer long river, which forms most of the border between Bosnia and Herzegovina and Serbia. It is the longest tributary of the Sava River and the longest karst river in the Dinaric Alps which belongs to the Danube river watershed...

 river at the western Serbia
Serbia
Serbia , officially the Republic of Serbia , is a landlocked country located at the crossroads of Central and Southeast Europe, covering the southern part of the Carpathian basin and the central part of the Balkans...

n border, and battles commenced, the heaviest being Battle of Mačkov Kamen and Battle on Gučevo
Gučevo
Gučevo is a mountain in western Serbia, near the town of Loznica, overlooking the Drina river and Banja Koviljača. Its highest peak Crni vrh has an altitude of 779 meters above sea level....

. In early October, Serbian army was forced to retreat, and later regrouped to fight the subsequent Battle of Kolubara
Battle of Kolubara
The Battle of Kolubara was a major victory of Serbia over the invading Austro-Hungarian armies during World War I. The invaders were routed, and driven back across the Serbian border....

.

Prelude

After the lost Battle of Cer
Battle of Cer
The Battle of Cer also known as Battle of Jadar was one of the first battles of World War I, it also marked the first Allied victory in the war. The battle was fought between the Austro-Hungarian Army and Serbian forces. The results improved Serbian standing in the Alliance...

 in August 1914, Austro-Hungarian army retreated over the Drina river back into Bosnia
Bosnia (region)
Bosnia is a eponomous region of Bosnia and Herzegovina. It lies mainly in the Dinaric Alps, ranging to the southern borders of the Pannonian plain, with the rivers Sava and Drina marking its northern and eastern borders. The other eponomous region, the southern, other half of the country is...

 and Syrmia
Syrmia
Syrmia is a fertile region of the Pannonian Plain in Europe, between the Danube and Sava rivers. It is divided between Serbia in the east and Croatia in the west....

. Under pressure of its allies, Serbia conducted a limited offensive across the Sava river
Sava River
The Sava is a river in Southeast Europe, a right side tributary of the Danube river at Belgrade. Counting from Zelenci, the source of Sava Dolinka, it is long and drains of surface area. It flows through Slovenia, Croatia, along the northern border of Bosnia and Herzegovina, and through Serbia....

 into the Austro-Hungarian Syrmia
Syrmia
Syrmia is a fertile region of the Pannonian Plain in Europe, between the Danube and Sava rivers. It is divided between Serbia in the east and Croatia in the west....

 with its Serbian First Army
Serbian First Army
The Serbian First Army was a Serbian field army that fought during World War I.-August 1914:*First Army - staff in the village Rača**I Timok Infantry Division - Smederevska Palanka...

. Meanwhile the Timok division I of the Serbian Second Army suffered a heavy defeat in a diversionary crossing, suffering around 6,000 casualties while inflicting only 2,000.

With most of his forces in Bosnia, general Potiorek decided that the best way to stop the Serbian offensive was to launch another invasion into Serbia to force the Serbs to recall their troops to defend their much smaller homeland.

The offensive

September 7 brought a renewed Austro-Hungarian attack from the west, across the river Drina
Drina
The Drina is a 346 kilometer long river, which forms most of the border between Bosnia and Herzegovina and Serbia. It is the longest tributary of the Sava River and the longest karst river in the Dinaric Alps which belongs to the Danube river watershed...

, this time with both the Fifth Army in Mačva
Macva
Mačva is a geographical region in Serbia, mostly situated in the northwest of Central Serbia. It is located in a fertile plain between the Sava and Drina rivers. The chief town of this region is Šabac. The modern Mačva District of Serbia is named after the region, although the region of Mačva...

 and the Sixth further south. Initial attack by the Fifth Army was repelled by the Serbian Second Army, with 4,000 Austro-Hungarian casualties, but the stronger Sixth Army managed to surprise the Serbian Third Army and gain a foothold. After some units from the Serbian Second Army were sent to bolster the Third, the Austro-Hungarian Fifth Army also managed to establish a bridgehead with a renewed attack. At that time, Marshal Putnik withdrew the First Army from Syrmia (against much popular opposition) and used it to deliver a fierce counterattack against the Sixth Army that initially went well, but finally bogged down in a bloody four-day fight for a peak of the Jagodnja
Jagodnja
Jagodnja is a mountain in western Serbia, near the town of Krupanj. Its highest peak Košutnja Stopa has an altitude of 939 meters above sea level....

 mountain called Mačkov Kamen, in which both sides suffered horrendous losses in successive frontal attacks and counterattacks. Two Serbian divisions lost around 11,000 men, while Austro-Hungarian losses were probably comparable.

Marshal Putnik ordered a retreat into the surrounding hills and the front settled in a month and a half of trench warfare
Trench warfare
Trench warfare is a form of occupied fighting lines, consisting largely of trenches, in which troops are largely immune to the enemy's small arms fire and are substantially sheltered from artillery...

, which was highly unfavourable to the Serbs, who were inferior in heavy artillery, ammunition stocks, shell production (having only a single factory producing around 100 shells a day) and also footwear, since the vast majority of infantry wore the traditional (though state-issued) opanak
Opanak
Opanak are traditional peasant shoes worn in Southeastern Europe . The attributes of the Opanci are: a construction of leather, lack of laces, durable, and various ending on toes. In Serbia, the design of the horn-like ending on toes indicates the region of origin...

s, while the Austro-Hungarians had soak-proof leather boots. Most of the war material was supplied by the Allies, who were short themselves. In such a situation, Serbian artillery quickly became almost silent, while the Austro-Hungarians steadily increased their fire. Serbian daily casualties reached 100 soldiers from all causes in some divisions (notably in Combined division).

During the first weeks of trench warfare, the Serbian Užice Army (one strengthened division) and the Montenegrin Sanjak Army (roughly a division) conducted an abortive offensive into Bosnia. In addition, both sides conducted a few local attacks, most of which were soundly defeated. In one such attack, the Serbian Army used mine warfare
Mine warfare
Mine warfare refers to the use of different types of explosive devices:*Land mine, a weight-triggered explosive device intended to maim or kill people or to destroy vehicles...

for the first time: Combined division dug tunnels beneath the Austro-Hungarian trenches (that were only 20-30m away from the Serbian ones on this sector), planted mines and set them off just before an infantry charge.
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