France.
2. On May 20 it entrained for France. (Itinerary: Vilna-Insterberg-Allenstein-Bromberg-Landsberg-Berlin-Stendal-Minden-Duesseldorf-Aix la Chapelle-Verviere-Liége-Brussels-Audenarde.) It detrained at Elsegem on May 25.
Cambrésis.
3. Transferred to Cambrai on June 10, it took over the Moruvres-Avrincourt sector, which it occupied from June 12 to the beginning of August.
Flanders.
4. It was thereafter brought to the Ypres front to the south of the railway running from Ypres to Roulers (Aug. 19). Artillery fire caused it to lose heavily; the British attack of September 20, of which it bore the brunt, increased its losses. Before the battle of the 20th the 12th Company of the 56th Reserve Regiment was reduced to 65 men, of whom 40 were men of the class of 1918. The 9th Company was entirely destroyed or captured.
5. Relieved in the night of the 21st of September the division was sent to rest (region of Mars la Tour) and reorganized (more than 2,000 men coming from the 605th and 614th Landstrum, Batallion X 12, and the 109th Landwehr). These replacements were very heterogeneous—soldiers from Westphalia, Hanover, Baden, Magdeberg (men previously wounded and convalescents).
Cotes de Meuse.
6. At the beginning of October the 121st Division took over a sector near Cotes de Meuse (les Éparges, Ravin de Malochis). It stayed there until about April 10, 1918.