Incredibly interesting--PBS--"The Ghost Army"

this UK ghost Army was created to make the german army think the invasion is taking place in a different spot. The smallest distance over the channel. Secret service did a great job here. And the taken route was not the easiest thats why the germans never expected the invasion there.

But making those kinda "tricks" to show a bigger army or an army somewhere else is very common very before the greeks and romanian reich ;-)