1916.
1. The division occupied the sector Chavonne-Soupir south of Braye en Laonnois until the end of June, 1916.
Somme.
2. At the beginning of July, as soon as the Franco-British offensive began, the 15th Reserve Division detached some of its elements to reenforce divisions engaged along the Somme, especially at Flaucourt (July 2 and 3), Hem wood, and the Vermandovillers area (August).
Aisne.
3. Some of these elements returned to the Aisne and were reassigned to the Liebert (new 15th Reserve Division) and the Dumrath Division.
Somme.
4. The 17th and 30th Reserve Infantry Regiments remained in the Somme area. Separated at first, at the end of August they formed the 32d Brigade reattached to the 35th Division which held the front in the area of Estrees-Ablaincourt (September).
5. At the beginning of October the 15th Reserve Division once more reorganized its original elements, and occupied the lines between Fouquescourt and the north of Andechy.
6. The division was relieved from the Somme front about December 15.