On the night of 7/8 July 617 Squadron with Cheshire in his Mustang flew against the limestone cave at St. Leu d’Esserent being used to store V-1s and V-2s. It was his 100th mission, and would be his last with Bomber Command. Tallboy strikes caused a partial collapse of the cave, and the tunnels were blocked off. The following day Cochrane took Cheshire off ops. At the same time he stood down Shannon, Munro and McCarthy, the surviving 617 Dams raids pilots.