The division's first mission was Operation Tonga on 6 June 1944, D-Day, part of the Normandy landings, where it was responsible for securing the left flank of the Allied invasion during Operation Overlord. The division remained in Normandy for three months before being withdrawn in September. The division was entrained day after day later that month, over nearly a week, preparing to join Operation Market Garden but was eventually stood down. While still recruiting and reforming in England, it was mobilised again and sent to Belgium in December 1944, to help counter the surprise German offensive in the Ardennes, the Battle of the Bulge. Their final airborne mission followed in March 1945, Operation Varsity, the second Allied airborne assault over the River Rhine.