Operation Fortitude was a crucial deception strategy used by the Allies during World War II, specifically leading up to the D-Day invasion of Normandy on June 6, 1944. Its primary goal was to mislead the German military about the location and timing of the Allied invasion, making them believe that the attack would occur at Pas de Calais rather than in Normandy. The operation was divided into two parts: Fortitude North and Fortitude South. Fortitude North aimed to convince the Germans that an invasion of Norway was imminent, while Fortitude South suggested an attack on France through the Pas de Calais. This successful deception helped ensure the success of the actual invasion by diverting German forces away from the true landing sites.