In March and in June, 1915, the division underwent two heavy attacks at Neuve Chapelle and at Festubert. The battles from the 6th to the 29th of March, 1915, cost the 13th Infantry Regiment 21 officers and 1,301 noncommissioned officers in killed, wounded, and missing. (Official list of Prussian casualties.)
In March the division transferred the 158th Infantry Regiment to the 50th Division, a new formation.
1916.
Verdun (Hill 304).
1. Relieved at the end of March, 1916, the 13th Division was sent to rest in the Cambrai area.
2. About the 5th of June the division entrained and was sent to the Verdun area by way of Montmédy-Stenay. It went into line in the sector of Hill 304, which it occupied until the month of September.
Somme.
3. Transferred to the Somme, it took part in the battle on September 12 (south of Vouchavesnes-Cléry sur Somme). It suffered heavy losses there which necessitated its being relieved on September 19.
4. It was quickly reorganized in the Dun area and put back in the sector of Hill 304 (Oct. 10).