sion, placing it in the same place that the radio signals had said.
             An incredibly important point to the deception was Ultra, code name for intelligence obtained from intercepts of German radio traffic. This was made possible by the British early in the war having broken the code of the standard German radio enciphering machine, the Enigma. Through Ultra the Allied high command knew what the Germans expected the Allies to do and thus could plant information either to reinforce an existing false view or to feed information through German agents, most of it false but enough of it true-and thus sometimes involving sacrifice of Allied troops, agents or resistance forces in occupied countries-to maintain the credibility of the German agents. The Allies also had a plan known as Jael, which involved whispering campaigns in diplomatic posts around the world and various distractions to keep German eyes focused anywhere but on the coast of northwestern France.
             Facing the invaders was Hitler's "Atlantic Wall". This was a wall of concrete and steel encomp
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