It definitely was not Rickenbacker that brought
him down. I don't know if the Americans ever tangled with the Red Barons so
called Flying Circus group commanded by Richthofen.

I recall that Rickenbacker once tangled with a German aircraft that was painted
largely in red and he attributed the aircraft to von Richthofen's unit. This
was the signature color of von Richthofen's unit though only his personal
aircraft was ever painted in over all red. It is unlikely that Rickenbacker
fought von Richthofen but he might have fought one of the other von
Richthofen's or someone else in that unit.

John Dupre'