sentences:  The Brécourt military installation was virtually undetectable by aerial observation.However, the 387th Bombardment Group records indicate Operation Crossbow bombing in Manche of a "Martinvast V-1 site" on 11 November 1943, which may have been Brécourt.The launch pad was not fully completed when the Allies captured Brécourt a few days before July 4, 1944. both Dwight Eisenhower and Winston Churchill subsequently visited the facility.