The Allied invasion was detailed in several overlapping operational plans. According to the D-Day Museum:
"The armed forces used code names to refer to the planning and execution of specific military operations. Operation Overlord was the codename for the Allied invasion of northwest Europe. The assault phase of Operation Overlord was known as Operation Neptune. Operation Neptune began on D-Day (6 June 1944) and ended on 30 June 1944. By this time, the Allies had established a firm foothold in Normandy. Operation Overlord also began on D-Day, and continued until Allied forces crossed the River Seine on 19 August 1944."[10]
Just prior to the invasion, General Eisenhower transmitted a now-historic message to all members of the Allied Expeditionary Force. It read, in part, "You are about to embark upon the great crusade, toward which we have striven these many months."[11] In his pocket was a statement, never used, to be read out in case the invasion failed.[12]
Deception plans[edit source | editbeta]
Under the high-level plan Operation Bodyguard, the Allies had instituted a comprehensive and complex series of deceptions which led to …show more content…
Normandy was isolated as of 7 June. The telephone network in the invasion area was put out of order and beginning June 20, the railway lines of France were rendered inoperable, except in the Rhone Valley where the line Marseilles-Lyon was kept open by the Germans despite heavy engagements with [partisan] units.... Although the German local reserves were able to reach the front area despite resistance action... marked delays were achieved against the movement of strategic reserves. The French claim to have delayed up to 12 divisions for 8 to 15