who came up with the d day invasion
Operation Overlord Attendees at the Trident Conference in Washington in May 1943 took the decision to launch a cross-Channel invasion within the next year.[32] Churchill favoured making the main Allied thrust into Germany from the Mediterranean theatre, but his American allies, who were providing the bulk of the men and equipment, over-ruled him.[33] British Lieutenant-General Frederick E. Morgan was appointed Chief of Staff, Supreme Allied Commander (COSSAC), to begin detailed planning.[32] The initial plans were constrained by the number of available landing-craft, most of which were already committed in the Mediterranean and in the Pacific.[34] In part because of lessons learned in the Dieppe Raid of 19 August 1942, the Allies decided not to directly assault a heavily defended French seaport in their first landing.[35] The failure at Dieppe also highlighted the need for adequate artillery and air support, particularly close air support, and specialised ships able to travel extremely close to shore.[36] The short operating-range of British aircraft such as the Spitfire and Typhoon greatly limited the number of potential landing-sites, as comprehensive air-support depended upon having planes overhead for as long as possible.[37] Morgan considered four sites for the landings: Brittany, the Cotentin Peninsula, Normandy, and the Pas de Calais. As Brittany and Cotentin are peninsulas, the Germans could have cut off the Allied advance at a relatively narrow isthmus, so these sites were rejected.[38]