This article highlights the role of Coastal Command in the days leading up to the D-Day landings, and the patrols flown to protect the invasion forces during the build up and in the weeks that followed. Called “Operation Cork”, anti-U-Boat patrols were flown in the Western Approaches and the English Channel. Numerous U-Boats were sunk or severely disabled and those that survived inflicted minimal damage. The Beaufighter ands Mosquito Wings attacked E-Boats and surface warships with devastating results. This aspect of the success of the D-Day landings rarely gains mention and this article has been written to bring their outstanding exploits to wider attention