In 1885, Eugen was assigned to the General Staff and rapidly rose through the ranks. He commanded a battalion of Infantry Regiment 13 as a lieutenant colonel before assuming command of the entire regiment as a colonel. Following a further regimental assignment as commanding officer of Hussar regiment 13, he assumed command of an infantry brigade in Olmütz and then a division in Vienna. In 1900 he was appointed to the command of XIV Army Corps in Innsbruck and promoted to General der Kavallerie on 27 April 1901. This command simultaneously also made him the commanding general in Innsbruck and the defence commander for the Tyrol. He was appointed eight years later as an army inspector and senior defence commander for the Tyrol. When in 1909 the possibility of a war against Serbia was in the air he alongside Archduke Franz Ferdinand and General Albori was named as a presumptive army commander.