 Here's a quick thread on the Americans who parachuted behind enemy lines on D-Day, which is among the most insane things anyone's ever done in military combat. And this was all taken from John Keegan's Six Armies in Normandy. I've read a lot of John Keegan books. I've not read that one. I probably will. First of all, it's important to remember that there basically were no parachutists prior to World War II. It was a brand new thing. And the Allies only belatedly figured out the technique with a lot of men dying along the way.