#8: When the U.S. Created a Fake Army to Trick Hitler (1944)
Operation Fortitude aimed to mislead the Germans into thinking that the main assault would be at Pas-de-Calais instead of Normandy. Creating fake military formations preparing for an invasion, with General George Patton put in charge to increase its credibility, it succeeded due to the Allied use of Ultra, a signals intelligence system that intercepted and decrypted German communications.
