The German offensive in Courland was intended to be a diversion while the main effort was made further south by the German 11th Army and Austro-Hungarian 4th Army in the Gorlice–Tarnów Offensive.

Generalleutnant von Lauenstein remained as commander of XXXIX Reserve Corps.

The Army of the Niemen was formed on 26 May 1915 to control the troops in Courland.

[4] The former commander of the 8th Army, General der Infanterie Otto von Below, along with his chief of staff, Generalmajor von Böckmann, assumed command.

The Army of the Niemen took part in the successful German Riga–Schaulen offensive.