When that campaign was over, the division returned to England, arriving there on 5 November 1943 to prepare for the eventual invasion of Normandy. The 1st Infantry Division and one regimental combat team from the 29th Infantry Division comprised the first wave of troops that assaulted German Army defenses on Omaha Beach on D-Day. The division had to run 300 yards to get to the bluffs, with some of the division's units suffering 30 percent casualties in the first hour of the assault, and secured Formigny and Caumont in the beachhead by the end of the day. The division followed up the Saint-Lô break-through with an attack on Marigny, 27 July 1944.