The preparations for the Somme offensive of July 1916 brought a group of casualty clearing stations (the 1st/1st South Midland, 21st, 34th, 45th and Lucknow, section "B") to Daours. The extension to the communal cemetery was opened and the first burials made between June and November 1916. The Allied advance in the spring of 1917 took the hospitals with it, and no further burials were made in the cemetery until April 1918, when the Germans recovered the ground they had lost. From April to the middle of August 1918, the extension was almost a front line cemetery. In August and September 1918, the casualty clearing stations came forward again (the 5th, 37th, 41st, 53rd, 55th and 61st) but in September, the cemetery was closed. The extension was designed by Sir Edwin Lutyens.