Codeword Overlord: Axis Espionage and the D-Day Landings

The Allied invasion of Europe during summer 1944 was widely expected, and it fell to the Axis intelligence services to provide High Command with advance warning of the precise date and place of the landings. Using cryptanalysis of Allied signals, undercover agents and ships, and photographic evidence, Axis intelligence was pitted directly against their Allied counterparts, who actively tried to create a decoy and aim their enemies at the wrong location. The success of Operation Overlord has...