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?
Battle of Kolubara The Battle of Kolubara (Serbian: Колубарска битка, "Kolubarska bitka" , German: "Schlacht an der Kolubara" ) was fought between Austria-Hungary and Serbia in November and December 1914, during the Serbian Campaign of World War I. It commenced on 16 November, when the Austro-Hungarians under the command of Oskar Potiorek reached the Kolubara River during their third invasion of Serbia that year, having captured the strategic town of Valjevo and forced the Serbian Army to undertake a series of retreats. The Serbs withdrew from Belgrade on 29–30 November, and the city soon fell under Austro-Hungarian control. On 2 December, the Serbian Army launched a surprise counter-attack all along the front. Valjevo and Užice were retaken by the Serbs on 8 December and the Austro-Hungarians retreated to Belgrade, which 5th Army commander Liborius Ritter von Frank deemed to be untenable. The Austro-Hungarians abandoned the city between 14 and 15 December and retreated back into Austria-Hungary, allowing the Serbs to retake their capital the following day.
Raid on Pula Raid on Pula was a maritime raid undertaken on 1 November 1918 during the end of World War I. It was carried out by two officers of the Italian Regia Marina with the goal of damaging the Austro-Hungarian fleet anchored in the bay of Pula. The fleet was handed by the Austrians to the newly established State of Slovenes, Croats and Serbs only a couple of hours before the raid, with Janko Vuković, previously an officer of the Austro-Hungarian navy, being declared the commander-in-chief of the new state's navy. State of SHS, declared neutrality in the war and informed the Allies shortly after taking over armed forces on 31 October. However, the attackers were not aware of this, and had rigged the main ship SMS Viribus Unitis (renamed to Jugoslavija) with explosives, which ended in the ship's sinking and the death of Vuković.