I have read accounts of this raid in the past. It was indeed a bold move. I have a fascination with the Fieseler Fi 156. I have read that in a good head wind the plane could hover. The German's were so far advanced in aircraft design at the on-set of WWII because, after WWI, they were forbidden to build powered aircraft... so they built gliders. Building gliders taught them a whole lot about wing design and aerodynamics. Clearly, that knowledge was applied to the Fi 156.