 Seventh Army; another from the 10th Armored Division of Walker's XX Corps, which at Kaiserslautern was in a position to swing south and southeast through the Pfaelzer Forest and cut the escape routes; and a third from the Argus-eyed fighter bombers of the XII Tactical Air Command.It was the last that was most apparent to the rank and file of the retreating Germans.Since speed was imperative, the men had to move by day as well as by night, virtually inviting attack from the air.