Bazna had also conveyed a document that carried the highest security restriction (BIGOT list) about Operation Overlord (the code name for the Invasion of Normandy in June 1944). It included intelligence that the British ambassador was to request the use of Turkish air bases "to maintain a threat to the Germans from the eastern Mediterranean until Overlord is launched." The information about the Normandy Invasion was not known by the Germans until after the war. Had it been provided in time, Operation Overlord (the preparations for D-Day) would have been compromised. He also provided intelligence that might have made the Germans believe that there was no danger of attack in the Balkans.