He was shot down and captured on 13 July 1917, and spent the rest of the war as a PoW, for much of the time in Holzminden.
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Peter Calvocoressi was head of the Air Section at Bletchley Park that translated and analysed all deciphered Luftwaffe messages.
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There had been mentions of Enigma decryption in earlier books by Władysław Kozaczuk, Ladislas Farago, and Gustave Bertrand.
F. W. Winterbotham (1897–1990), World War II British intelligence officer