Operation Overlord
All the same, there were several leaks before or on D-Day. An embassy spy in Istanbul gave the Germans documents containing references to Overlord, but these documents lacked detail. Another leak was General Charles de Gaulle's radio message after D-Day. He stated that this invasion was the real invasion. This had the potential to ruin the Allied tricks. Eisenhower referred to the landings as the initial invasion. The Germans did not believe de Gaulle and waited too long to move in extra troops against the Allies.