1915.
Formed in April, 1915, near Tournai, the 115th Division received the 136th and 171st from the 30th and 39th Divisions (15th Corps), respectively, and the 40th Reserve Regiment from the 28th Reserve Division (14th Reserve Corps).
1. In April, 1915, the 115th Division was in reserve in the Tournai-Courtrai region.
Artois.
2. In May it was sent as a reenforcement to the north of Arras and fought at Notre Dame de Lorette and Neuville St. Vaast and was sorely tried. The infantry losses amounted to 128 officers and 5,208 men out of action (Casualty List), of which 47 officers and 2,258 men belonged to the 171st Regiment.
Aisne.
3. Relieved about June 15, the 115th Division took over the Missy sur Aisne sector (east of Soissons), which it occupied until the last days of July.
Russia.
4. At the end of July it was transferred to the Eastern Front, and for a time in August operated on the Narew.
5. It took part in the summer offensive. It was before Kovno on August 19, in the region of Vileiki at the end of September, and near Narotch Lake at the beginning of October.