May 22 marked an important, and indeed dramatic stage in Britain's ability to read some of the most secret German wireless communications, for on that day the decrypters at Bletchley Park broke the German Enigma key most frequently used by the German Air Force. Henceforth British Intelligence was able to read, each day, every German Air Force message sent from headquarters to the field, and from the field to headquarters.
From: Martin Gilbert, The Second World War, A Complete History, Herry Holt and Company, Inc., New York, 1989, p. 71.
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