what did the allies do prior to the d day invasion
Operation Overlord was the codename for the Allied invasion of northwest Europe. The assault phase, or the establishment of a secure foothold, was known as Operation Neptune. Operation Neptune began on D-Day (June 6, 1944) and ended on June 30, when the Allies had established a firm foothold in Normandy.Operation Overlord also began on D-Day, and continued until Allied forces crossed the River Seine on August 19.he Army began to use the codes H-hour and D-Day during World War I, to indicate the time or date of an operation s beginning. So the D may simply refer to the day of invasion. With the invasion of Normandy, General Dwight D. Eisenhower faced a task of magnitude and hazards never before attempted.