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Not to be flown on operational aircraft - for fear the plans would fall into German hands prior to the invasion.
The most up-to-date maps for the D-Day invasion have come to light 72 years later to show the incredible detail the Allies went to to ensure victory.
The 24 original maps were drawn up just two weeks before the momentous operation and gave the military commanders the most contemporary reports of the state of the five Normandy beaches.
The charts, marked 'Top Secret', were so detailed they contained almost the exact number and positions of mines, pill boxes and other defence works the Germans had laid as part of Hitler's Atlantic Wall.
They are being sold in eight separate lots by C&T Auctioneers of Ashford, Kent, on September 7.