May I suggest an excellent book on this subject. Written by an English Historian named Anthony Cave Brown.
“Bodyguard of Lies: The Extraordinary True Story Behind D-Day”
ISBN-10: 9781599213835
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I read this book in 1976 when it first came out. This book made me a History Student. I spent almost 10 years reading related material because of the impact of this book. For me the truly interesting part was the Sig/Intel of the time and the impact on WWII.
Those were truly the “times that try men’s souls” (as these are).
>>Those were truly the times that try mens souls (as these are).<<
The difference is that at that time there were men (and women) who cared about the USA and freedom as both a structure and a concept.
The only people who feel “these times are those that try men’s souls” are those not on the dole (need I remind everyone that fewer than 1/2 of all Americans pay .01 in taxes?) and those whose religious/ideological fellation of a pedophile is exalted upon the altar of Political Correctness.
These are not the times that “try men’s souls” since souls are in such a meager supply.
As an Air Force Tech Controller(307X0), I was privileged to have been taught the then still Classified Counter Measures and Counter Counter Measures of WWII.