Why did German commanders believe the Allied invasion of France would come at Pas-de-Calais?

German commanders believed the Allied invasion of France would occur at the Pas-de-Calais region primarily due to military logic, as it represented the narrowest point of the English Channel between England and France.12

To reinforce this assumption, the Allies implemented Operation Fortitude, a sophisticated deception campaign designed to convince the German high command that the main landing would take place in the Pas-de-Calais rather than in Normandy. Key tactics included:13

• The Phantom Army: The Allies created a fictitious force known as the First U.S. Army Group (FUSAG), complete with decoy tanks, aircraft, and infrastructure on the southeast coast of England.13
• Command Credibility: The Allies publicly placed George S. Patton—a general highly feared and respected by the Germans—in command of this phantom army, which lent the deception significant weight.13
• Disinformation: The Allies utilized double agents, spurious radio transmissions, and radar decoys to simulate an invasion fleet heading toward Calais.13

These efforts successfully persuaded many German leaders that the Normandy landings were merely a diversion, leading them to withhold vital reinforcements from the actual invasion site.14