After graduating from the school for infantry reserve officers in Graz, he participated in the Italian campaign during World War I. He participated in the first and second battles of the Isonzo, where he contracted Typhoid fever. After recovering, he was transferred to the Tyrolean sector of the front. For his bold attacks on the Italian stronghold on Monte Zebio he received the Golden Medal and transferred to the 87th Infantry regiment in Celje. In October 1918, he started to study law at the University of Graz.