How did the allies trick the Germans before landing on Normandy?

Before the D-Day landings at Normandy, the Allies executed a comprehensive deception campaign known as Operation Bodyguard. This included creating a fictitious army group, led by General Patton, stationed in southeast England, which misled the Germans into believing that a major invasion would occur at Pas de Calais rather than Normandy. Additionally, the Allies employed tactics such as fake radio transmissions, inflatable tanks, and misleading double agents to reinforce this illusion, ultimately achieving strategic surprise on June 6, 1944.