One of the most extraordinary things about the D-Day landings of 1944 was Hitler’s response. The German Fuhrer was utterly convinced the attack was a feint. Even as thousands of Allied troops stormed the beaches of Normandy and headed inland, he remained certain the real attack was still to come. He was so sure the Allies would land in the Calais region that he held back troops there for vital weeks after the invasion.
Why was he so thoroughly convinced?