Wikipedia
Brécourt was a Nazi Germany bunker started inside an underground French Naval oil storage facility. On July 7, 1943, the site was ordered to be completed as a V-2 rocket launch facility. Early in 1944, the facility was converted to a V-1 flying bomb launch facility
and subsequently completed.
The military installation was virtually undetectable by aerial observation,
although the 387th Bombardment Group records indicate Operation Crossbow bombing of the " Martinvast V-1 site" on November 11, 1943. The Allies captured the site a few days before July 4, 1944, and both Dwight Eisenhower and Winston Churchill subsequently visited the facility .
Guillaume Marcoureau, better known as Brécourt, (10 February 1638 – 28 March 1685) was an 17th-century French playwright and actor.