Military intelligence, grossly neglected during the interwar
period, had by mid-1942 proved itself indispensable through
information gathered from intercepted radio messages in the
supposedly unbreakable German Enigma cipher. Ralph Bennett, who
worked for four years at Bletchley Park as a senior producer of the
intelligence (Ultra') derived from the Enigma decrypts, illustrates
in this collection of reprinted essays some of the steps by which
he and others developed the new type of information and in the
process a candid glimpse of the workings of British intelligence
both past and present.
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