The Allies assigned codenames to the various operations involved in the invasion. "Overlord" was the name for the landing on the Continent. 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.