National Archives

The ingenuity of the 23rd wasn't limited to battlefield theatrics. Actors within the Ghost Army impersonated U.S. general and hi-ranking officers in European towns, brazenly discussing fake military plans over casks of wine and fooling German spies. Architects and set designers even constructed dummy camps and airfields, complete with tents and laundry drying on clotheslines, and fake convoys of empty trucks ferrying back and forth.

Hollywood has taken notice, as well, and a "Ghost Army" film is currently being developed by "American Sniper" actor Bradley Cooper and producer Todd Philips.