The Americans joined the war in December 1941, and by 1942 they and the British who had been saved from the shorelines of Dunkirk in May 1940 in the wake of being defeated by the Germans in the Battle of France were conspiring about a possible Allied attack in the English Channel. The next year, Allied plans for a cross-Channel attack started to take shape.
In November 1943, Adolf Hitler, who knew about the danger of an attack along France's northern coast, appointed Erwin Rommel and made him responsible for initiating security operations in the district, although the Germans did not know precisely where the Allies would strike. Hitler gave Rommel the duty of completing the Atlantic Wall, a 2,400-mile fortifications of landmines and shoreline.
General Dwight Eisenhower was named leader of Operation Overlord in January of 1944. In the months leading up to D-Day, the Allies completed a gigantic misleading operation planned to deceive the Germans about the primary attack target as Pas-de-Calais which was the tightest point in the middle of Britain and France as opposed to Normandy. Moreover, they made the Germans to trust that Norway and different areas were likewise potential attack targets. Numerous strategies was utilized to do the deception, including use of fake machinery and a ghost armed force directed by George Patton which was situated in England (Hinsley et al