L-4. His L-4, bearing US Army serial number 43-30426 and named Rosie the Rocketer, armed with six bazookas, had notable success in an engagement during the Battle of Arracourt on September 20, 1944, employing top attack tactics in knocking out at least four German armored vehicles, as a pioneering example of taking on heavy enemy armor from a slow-flying aircraft.

The Germans were also engaged in such ad hoc low-speed light aircraft platforms for ground attack