“Three factors defeated us in the West,” said von Rundstedt. “First, the unheard of superiority of your air force, which made all movement in daytime impossible; second, the lack of motor fuel—oil and gas—so that the Panzers and even the remaining Luftwaffe were unable to move; third, the systematic destruction of all railway communications so that it was impossible to bring [a] single railway train across the Rhine.
