Embarrassingly defeated by Serbia at the outbreak of the war, this was, for 10 points, what nation whose attack on Serbia started the First World War?
Forces from this polity during this war were routed at the battle of Kolubara. Its principal armed forces were known by the abbreviation KUK, and it would later see an end to hostilities with the armistice of Villa Giusti. A force of 60,000 defectors originally from this polity formed the "legions" that briefly occupied the Trans-Siberian railroad, and it suffered its last major defeat in this war at Vittorio Veneto. Conrad von Hötzendorf's attempt to relieve this polity's besieged fortress of Przemysl led to a disastrous campaign in the Carpathians, and its army was unable to recover from its 750,000 casualties in the Brusilov offensive. Its most spectacular success came at Caporetto. Embarrassingly defeated by Serbia at the outbreak of the war, this was, for 10 points, what nation whose attack on Serbia started the First World War?
Forces from this polity during this war were routed at the battle of Kolubara.
{Austria-Hungary} (do not prompt on {separate} names)