With the beaches secure, groups began deploying to France on June 16, 1944, ten days after the Normandy invasion by moving P-47 Thunderbolts to a beach-head landing strip. During the Battle of Normandy, its tactical air units then provided the air power for the Allied break-out from the Normandy beachhead in the summer of 1944 during the Battle of Cherbourg, Caen, and the ultimate breakout from the beachhead, Operation Cobra.