The American airborne landings in Normandy were the first United States combat operations during Operation Overlord, the invasion of Normandy by the Western Allies on June 6, 1944. Around 13,100 paratroopers of the U.S. 82nd Airborne and 101st Airborne Divisions made night parachute drops early on D-Day, June 6, followed by 3,937 glider troops flown in by day. As the opening maneuver of Operation Neptune (the assault operation for Overlord) the American airborne divisions were delivered to the continent in two parachute and six glider missions.