The Americans were early and persistent advocates of a direct strategy, a cross-channel attack that would first destroy German military in the West, and then drive deep into the heart of industrial Germany to end the war. The British, on the other hand, preferred to stage a number of small-scale attacks around the perimeter of fortress Europe. They thereby hoped to weaken German defenses before leaping precipitously across the channel into the teeth of the still powerful German Forces. The British simply could not afford the staggering losses entailed in a frontal assault on the northwest coast of Europe. British Lieutenant General Sir Frederick Morgan, Chief of Staff to the Supreme Allied Commander (COSSAC), ststed that "Certain British authorities instinctively recoiled from the whole affair, as well they might, for fear of the butcher bill." It is not surprising, then, that the harder the Americans pressed in 1942 and 1943 for a firm commitment on a cross-channel attack, the more the British seemed to fight against it.
After a debate lasting through moat of 1942, the Americans agreed to postpone any cross-channel attack because of the landings in North Africa, Operation Torch. The strategic outcome of Operation Torch was what American Chief of Staff General George C. Marshall had predicted. Success in Tunisia, which was the first the Allies had experienced against the Germans, inspired Churchill and his Chief of the Imperial Staff, Field Marshal Alan Brooke, to devise a strategy aimed at knocking Italy out of the war and at protecting British sea-lanes. It was not until the Teheran Conference in November 1943 that the British, encouraged by the Russians, reluctantly agreed to launch a cross-channel attack, code-named Operation Overlord, in May of 1944, and to allow President Franklin D. Roosevelt to name a commander for the operation. Although both Marshall and Brooke were contenders for the appointment, both even promised it, they were passed over. Instead, all favored in the selection of General Dwight D. Eisenhower, who was then commanding United States forces in Europe. On January 14 1944, Eisenhower, who was now Supreme Commander, Allied Expeditionary Force, arrived in London to begin work on the final invasion plan.
The Chief of Staff to the Supreme Allied Commander (COSSAC) planners proposed to land three divisions (two British and one American) abreast onto Normandy's sand and shingle beaches, followed immediately by two more and flanked on the east, near Caen, by elements of a British parachute division. Many details, including the exact landing date, were not specified by COSSAC in order to leave some flexibility to the Supreme Commander. The weather, tides, and light conditions required for the landing were outlined and calculated so that the precise calculations for H Hour on D Day could be made in the future. The plan also called for the pre-invasion strategic bombing of selected targets in Germany and France in an effort to destroy German tactical aircraft. Later air strikes would seek to intercept troop movements toward the lodgment area, and bombing patterns were carefully designed to avoid disclosing the actual landing sites. The landings themselves would be preceded by massive air strikes at the beach fortifications.
Throughout the winter and spring months of 1944, the details of Neptune (as the assault landing phase was now named) were settled and fitted into place. Planners at SHAEF (Supreme Headquarters, Allied Expeditionary Force) picked an early June date for D...