In the autumn of 1915, the Serbian army was still a participant in the First World War. The Serbian army was underestimated in the early portion of the war and faced an invasion by Austro-Hungarian forces under Marshall Conrad. The Austro-Hungarian forces invaded Serbia from the west and were intent upon destroying the Serbs and exacting revenge for the assassination of Archduke Franz Ferdinand. This quick victory was not in the making and the Serbian army under voivode Radomir Putnik drove back an Austro-Hungarian force at the River Vardar in August of 1914 (Keegan, 1995). Even after the capture of Belgrade, the Serbian forces were able to rally and drive the Austro-Hungarian forces from Serbian land in December 1914. This initial victory allowed for the continued Serbian presence in the war and was aided by the participation of Serbia's Russian allies. Serbia would be free from invasion until 1915, but the results in 1915 were far different. http://www.worldwar1.com/tgws/serbinv.htm
