On 25 March 1945, the U.S. Third Army crossed the Rhine. The 5th Infantry Division crossed in United States Navy landing craft near Oppenheim before the Germans could fire a shot. When the east bank was secure, a pontoon bridge was quickly constructed, and by 0300 on 26 March 1945, the 37th was across with the rest of the 4th Armored Division. The 37th advanced through the 5th Infantry Division perimeter; by noon Company D's light tanks and Infantry from the 10th Armored Infantry Battalion captured a railroad bridge intact near Aschaffenburg over the Main River. Meanwhile, Combat Command A (CCA) had secured the Main crossing near Hanau. The 37th, with the rest of CCB, sideslipped west and followed CCA across the Main on 28 March 1945. By dusk, the 37th's M4 tanks were in Giessen, north of Hanau. The Frankfurt-Berlin Autobahn was the 4th Armored Division's axis of advance. The 37th reached Hersfeld (today Bad Hersfeld) the last day of March. On 2 April 1945, under heavy air attack, the 37th crossed the Werra.