I stumbled on this movie/documentary on Amazon Prime (Which I recommend) but I know it's an older video but man is it absolutely interesting AND amusing to watch.
Here's the Youtube trailer.
I just love the thought of "how do we deceive the Germans?" I've always known about the inflatable tanks, trucks and planes...but never knew the exact extent to which it was carried out. Amazing to watch.
Good find. My former father-in-law was involved in a similar planning venture in Palestine during the war creating an illusionary front for what I believe was Greece and the Balkans.