1. Until October, 1915, the 18th Division occupied the sectors of the Aisne. On June 3 the 86th Fusiliers attacked at Quennevieres, suffering enormous losses. (Between June 18 and July 3 its 5th Company received at least 115 men as replacements; the 8th Company, 120.)
Champagne.
2. From October, 1915, until June, 1916, the 18th Division was in Champagne (Souain area).
1916.
1. On February 25, 1916, the 31st Infantry Regiment suffered heavy losses south of St. Marie a Py; its 11th Company was entirely destroyed or captured.
Somme.
2. From July to September, 1916, the 18th Division was in action along the Somme (south of the Somme). At Belloy, on September 4, the 4th Company of the 86th Fusiliers was destroyed with the exception of 23 men.
Artois.
3. From October until the beginning of December the division was in the Arras area (east).
4. It left Artois about December 12 to take over a sector along the Somme (Grandcourt).