Operation Ruthless

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Across
  1. 3. the name of a deception operation devised by Ian Fleming
  2. 5. Lieutenant Commander of the Admiralty's Naval Intelligence Division, who later wrote the James Bond novels
Down
  1. 1. the two leading codebreakers ____________ and Peter Twinn knew that getting hold of the German Navy Enigma
  2. 2. physical location where decoding the Enigma-enciphered traffic of the German air force, army and intelligence and counter-espionage service
  3. 4. attempt to gain access to German Naval codebooks.