Codeword Overlord : Axis Espionage and the D-Day Landings
(Reklamlänk)
It was inevitable that the Allies would invade France in the summer of 1944: the Nazis just had to figure out where and when. This job fell to the Abwehr and several other German intelligence services. Between them they put over 30,000 personnel to work studying British and American signals traffic,
