The Germans were convinced by skillful disinformation the Americans would make a holding attack, and the British the breakthrough, so the Germans massed against the British. The British attacked, pushing hard, the Germans committed their reserves, lots of shooting.
Well, right to the South General George Patton had been waiting for the commitment of the German reserve. He attacked under an artillery barrage and shattered the German force before him. His armoured Corps was loose inside Germany, and the only nearby dangerous German units were locked in battle with the British. Patton was just the man for what came next - a long range armoured attack intended to unhinge the German defenses. It went well. Patton's Corps was the right fist, the British army the left fist. The Germans truly got their rear ends kicked.
We're making another good fight story together to put in the history books.