1. Remained in the sector north of Dixmude during the whole of 1915.
2. At the end of July, 1915, the brigade Ersatz Battalions of the division were grouped into regiments. The 4th Ersatz Division was made up of the 359th, 360th, 361st and 362d Infantry. With the 37th Landwehr Brigade and the 2d Reserve Ersatz Brigade (Basedow Division) it constituted the Werder Corps (December).
1916.
1. The division was kept in the region of Dixmude until April, 1916.
2. After April a part of the division was sent east of Ypres between the Ypres-Roulers Railway and the Comines Canal. Some of the units of the division remained in line near Dixmude.
Somme.
3. About September 27 the division left Belgium for the Somme, where it was engaged during the first two weeks of October near Le Sars.
4. On October 15 it returned to Belgium and went back to the sector east of Ypres in November.
5. Sent to rest about November 30 and sent back to the Somme south of Bapaume, about the middle of December.