Normandy Campaign 6 June to 24 July 1944) Early on D-Day airborne troops landed in France to gain control of strategic areas. Aerial and naval bombardment followed. Then the invasion fleet, covered by an umbrella of aircraft, discharged Eisenhower’s assault forces. Soon the beachhead was secure, but its expansion was a slow and difficult process in the face of strong opposition. It was not until late in July that the Allies were able to break out of Normandy.