1915.
Alsace.
1. The 12th Landwehr Division was formed toward the end of April, 1915, with the elements of the Landwehr, which were distributed along the Alsatian front, between the Fecht and the district of Cernay, and which were assigned to the Fuchs Division at the time of the attacks upon Hartmannswillerkopf (March-April). The active brigade of the Fuchs Division having left the Vosges for Champagne, the 12th Landwehr Division grouped these elements of the Landwehr and occupied until May, 1917, the sectors included between the valley of Munster and Cernay. On the 21st of December, 1915, the 14th Jager Battalion, attached to the division, lost at Hartmannswillerkopf 840 killed, wounded, and missing (official list of casualties), and was withdrawn to be reorganized in Belgium.
1916.
Alsace.
1. Sector Guebwiller-Cernay.
At the end of September, 1916, the 40th Landwehr Regiment left the 12th Landwehr Division to be assigned to the 33d Division. It was replaced by the 436th Landwehr Regiment, which had been formed in May of the preceding year.
In October the battalions of Jagers and of the riflemen of the guard and the 9th Battalion of Jagers, attached to the 12th Landwehr Division, were sent to Macedonia.