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  1. Open Research: The double-cross system in the war of 1939 to …

  2. Double-Cross System - Wikipedia

  3. The Double-Cross System: The Incredible True Story of H…

  4. The double-cross system by J. C. Masterman | Open Library

  5. A Retrospective on John Masterman's The Double-Cross System

  6. People also ask
    The Double-Cross System or XX System was a World War II counter-espionage and deception operation of the British Security Service (a civilian organisation usually referred to by its cover title MI5).
    This was the famous "Double Cross" system, a highly effective deception that contributed to the success of the Allied Forces landing in Normandy on D-Day in June 1944 (see also Agent GARBO ).
    The "double" cross is known as a Patriarchal cross and is well described in the Wikipedia article. There's no point in reproducing more than a sample here: The Patriarchal cross is a variant of the Christian cross, the religious symbol of Christianity.
  7. Double Cross : The True Story of the D-Day Spies - Google Books

  8. Double Cross : The True Story of the D-Day Spies - Google Books

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