Somme.
5. Between September 12 and 15 the 21st Division was transferred to the Somme (sectors of Clery-Bouchavesnes), where it suffered heavily.
6. At the beginning of October it was withdrawn from the Somme front and sent to the Cotes de Meuse in the Apremont area, which it occupied until November 10.
7. At the end of November it again went into action on the Somme (sector of Gomiecourt wood of Kratz) and remained there until February 10, when it went to rest near Chaumont Porcien.
1917.
Aisne.
1. On February 26, 1917, the 21st Division was taken to the front south of Berry au Bac, between the Godat and Loivre.
2. The three regiments of the division were on line on April 16 and underwent our attack, which caused them very heavy losses (2,319 prisoners).
Russia.
3. Relieved, about April 19, the 21st Division rested for a few days in the Neufchatel area and then entrained for the Eastern Front (about May 9). On the 16th it detrained at Vilna. After reorganization, it took over a sector, on June 14, in the neighborhood of Postavy (north of Lake Narotch), which it occupied until the end of September. There was no important operation during this period.