The 1st Landwehr Division began the war on the Eastern Front. In 1914-15, it participated in the battles of Gumbinnen, Tannenberg, and 2nd Masurian Lakes. It then took part in the Gorlice-Tarnów Offensive. The division was then primarily employed in positional warfare until the armistice on the Eastern Front. In early 1918, it was transferred to the Western Front, where it was primarily employed in positional warfare in Flanders and Alsace-Lorraine.