Located north of the village, the Mailly-Maillet Communal Cemetery Extension contains 126 graves of men who died, mostly between August 11, 1915, and December 2, 1916: 122 British, 3 New Zealanders, and 1 Canadian.
While the war moved away from Mailly-Maillet for a few months after the Battle of the Somme, it returned violently to the village after Operation Michael, the first of the five German offensives of 1918, which began on March 21. Mailly-Maillet was then regularly bombarded, and the Allied troops occupying it took refuge in the catacombs beneath the village. The last soldier buried in this cemetery was a British soldier who died on 28 July 1918. Less than a month later, after a major Australian and British victory at Albert, this sector of the Somme saw the war finally recede.