It briefly fought on the Western Front during the Battle of Ypres, holding the line against the Allied attack.

On 22 April, it was transferred and placed with the Austrian 4th Army under Mackensen's command, behind the Gorlice–Tarnow gap, south of the Vistula River.

In July 1915, the 11th Army advanced into Russian territory in a general German offensive.

On 23 September 1915 a new 11th Army was created for the Serbian Campaign under command of Max von Gallwitz.

[3] The headquarters of the Army was situated in Veles on 31 January 1916, moved to Prilep on 5 October 1916 until the retreat to Hungary in September 1918.