Question: 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?
{'answer': 'Serbian Campaign', 'supporting_facts': [['Battle of Kolubara', 0], ['Serbian Campaign of World War I', 0]]}