On December 1 5, 1914, Serbian forces retake Belgrade from Austro-Hungarian troops, marking the end of the Battle of Kolubara. The Battle of Kolubara had begun on November 16 when Austria-Hungary launched an offensive against Serbian defensive positions on the Kolubara River as part of their third invasion of Serbia. By November 29/30, the Austro-Hungarian offensive had forced the Serbian defenders to withdraw from Belgrade. While the capture of the Serbian capital city had raised hopes for the Austro-Hungarians that the war would be over by the end of the year, such was not to be. The Austro-Hungarian 6th Army, which had taken Belgrade, was forced to halt its advance in order to avoid outrunning supply lines and to allow 5th Army to arrive as reinforcements. This delay allowed for the Serbian forces to regroup and resupply before launching a counterattack on December 2, catching the overextended Austro-Hungarian forces by surprise. Despite attempts to halt the Serbian advance and launch their own counter-offensive, the Austro-Hungarian positions in and around Belgrade were deemed untenable by December 13 and their forces were forced to retreat from the city over the following two days. On December 15, Serbian troops marched into the city and had regained complete control over Belgrade by the end of the following day.

At the beginning of the Battle of Kolubara, the Austro-Hungarian forces numbered 450,000 men with the Serbians numbering 400,000. By the end, Austria-Hungary had suffered 30,000 killed, 173,000 wounded, and 70,000 captured. Serbian casualties stood at 22,000 killed, 91,000 wounded, and 19,000 missing or captured.