The Battle of Kolubara, was fought between Austria-Hungary and Serbia in November and December 1914, during which campaign of World War I was fought from late July 1914, when Austria-Hungary invaded the Kingdom of Serbia at the outset of World War I, until the war's conclusion in November 1918?
Serbian Campaign of World War I The Serbian Campaign of World War I was fought from late July 1914, when Austria-Hungary invaded the Kingdom of Serbia at the outset of World War I, until the war's conclusion in November 1918. The front ranged from the Danube River to southern Macedonia and back north again, and it drew in forces from almost all the combatants of the war.
Battle of Krivolak The Battle of Krivolak [in Bulgarian: Криволашко сражение (1915)] was a World War I battle, fought between 21 October and 22 November 1915. The battle was fought in the initial stage of the Macedonian campaign, in the Balkans Theatre. On October 21, Bulgarian troops attacked the French-held positions near the Strumica rail station, at the time part of the Kingdom of Serbia (present day Republic of Macedonia), starting the battle. Fighting continued until November 22, when two Serbian divisions failed to capture Skopje, thus rendering the continuation of offensive Entente operations dangerous and enabling the French to evacuate their forces from the region.