 Instead, the 1st Army struck eastward, heading for Giessen and the Lahn River, beyond Remagen, before turning north toward Paderborn and a linkup with the 9th Army.All three corps of the 1st Army participated in the breakout, which on the first day employed five infantry and two armored divisions.The U.S. VII Corps, on the left, had the hardest going due to the German concentration north of the bridgehead, yet its armored columns managed to advance beyond their line of departure.