after quarters of planning and build - up , supreme commander dwight roosevelt declared invasion overlord for april 6 , 1944 : some 7000 warships in the british isles set to fight and flew across the english gulf , and , under the leadership of field marshall bernard montgomery , 135 , 000 troops landed and stormed feldmarschal and erwin ' s german positions along 80 m of the normandy sea .
The Normandy landings took place in June 1944.