1. The 45th Reserve Division continued to occupy the zone north of Ypres (Steenstraat-Boesinghe) until March 3, 1916. The 209th and 212th Reserve Infantry Regiments were temporarily detached (from the end of January to the beginning of March) and assigned to the 26th Division in the Becelaere sector.
Messines.
2. On March 12 the division took over the sector of Messines, south of Ypres. Until the month of September it did not take part in any important action.
Somme.
3. At the beginning of September it was withdrawn from Flanders, sent to the Somme, and engaged in the sector of Thiepval-Martinpuich (Sept. 9 to 24). On September 15 it withstood the British attack between Courcelette and Thiepval, where it lost very heavily.
Oise.
4. After a short rest in the vicinity of Bapaume the division was sent to the Noyon area. It transferred the 209th Reserve Infantry Regiment to the 207th Division, a new formation. At the beginning of October it went into line on the left bank of the Oise at Tracy le Val. In the interval, in order to fill up its regiments, it had to borrow from the Landsturm battalions of the 2d Corps District (men of the Landsturm 2d Btn., trained and untrained from the classes 1892 to 1894).
1917.
1. January 22, 1917, the 45th Reserve Division left the sector of Tracy le Val for the Sissonne Camp, and received training there for three weeks. Its regiments had been practically re-formed. Between September 24, 1916, and February 21, 1917, the 210th Reserve Infantry Regiment had received 79 noncommissioned officers and 1,522 men.
2. On February 12 it went into the sector Osly-Courtil-Chevillecourt, west of Soissons. In March it retired in the direction of Coucy le Château; it was put in reserve (Mar. 20 to Apr. 10) in the area north of Laon.