Operation Overlord
The Allies assigned codenames to the various operations involved in the invasion. Overlord was the name for the landing on the Continent (that is, western Europe). Getting a secure hold on the area was codenamed Neptune. It began on D-Day (6 June 1944) and ended on 30 June 1944. By this time, the Allies had control in Normandy. Operation Overlord also began on D-Day, and continued until Allied forces crossed the river Seine on 19 August 1944.