1. The 18th Reserve Division occupied the Lassigny area until October, 1915, without any serious engagements. In October it took over elements of the Hartz Division (6th Army), among others the 3d Battalion of the 31st Infantry Regiment which contained four battalions from May, 1915, to September, 1916.
Artois.
2. About October 23 the division was sent to Artois (Givenchy), where it launched several local attacks.
1916.
1. The 18th Reserve Division remained in the Liévin-Givenchy sector until July, 1916.
Somme.
2. After a few days at rest, July 13 to July 28, it took part in the battle of the Somme, north of Pozieres, in several serious attacks.
3. It was reorganized in the Valenciennes area during the second half of August.
4. At the end of August, it was sent northeast of Lens (Pont a Vendin).
5. At the beginning of October the 18th Reserve Division again went into action along the Somme, north of Combles, (Morval, Sailly Saillisel). It suffered heavily in a series of local attacks.