The Austro-Hungarian Army was the military force of the Austro-Hungarian Empire, which existed from 1867 to 1918. It was a dual structure, consisting of the Common Army and the Landwehr, representing the various ethnic groups within the empire. The army played a significant role in World War I, engaging in battles on multiple fronts. The army was known for its diverse composition, including soldiers from various nationalities such as Hungarians, Czechs, and Slovaks. Despite its size, the Austro-Hungarian Army faced challenges in coordination and communication, which affected its effectiveness during the war.