Mission Chicago was a pre-dawn glider-borne combat assault in the American airborne landings in Normandy, made by elements of the 101st Airborne Division on the early morning of June 6, 1944 during the Normandy landings of World War II. It was part of Operation Neptune, the assault portion of the Allied invasion of Normandy, codenamed Operation Overlord. Originally slated to be the main assault for the 101st Airborne Division, the glider operation instead became the first reinforcement mission after the main parachute combat assault, Mission Albany. Because the area of responsibility for the division was in close proximity to Utah Beach, the use of glider reinforcement was limited in scale, with most division support units transported by sea. Overview The 101st Airborne Division's objectives were to secure the four causeway exits behind Utah Beach, destroy a German coastal artillery battery at Saint-Martin-de-Varreville, capture buildings nearby at Mezières believed used as barracks and a command post for the artillery battery, capture the Douve River lock at la Barquette (opposite Carentan), capture two footbridges spanning the Douve River at la Porte opposite Brevands, destroy the highway bridges over the Douve at Sainte-Come-du-Mont, and secure the Douve River valley. In the process units would also disrupt German communications, establish roadblocks to hamper the movement of German reinforcements, establish a defensive line between the beachhead and Valognes, clear the area of the drop zones to the unit boundary at Les Forges, and link up with the veteran 82nd Airborne Division. Mission description Mission Chicago was the 27th serial of the airborne assault, and was flown by the troop carrier C-47 Skytrains of the 434th Troop Carrier Group at RAF Aldermaston. 52 aircraft acted as tugs for an equal number of CG-4A Waco gliders carrying 155 troops, a bulldozer, sixteen 57-millimeter (6-pounder) antitank guns, and 25 small vehicles. 2.5 tons of ammunition and 11 tons of equipment were also transported, including an SCR-499 radio set for the division headquarters command post. Chicago was primarily an artillery reinforcement mission. Aboard 44 gliders were Batteries A and B of the 81st Airborne Antiaircraft Battalion. The other 8 gliders carried small elements of the 326th Airborne Engineer Battalion, the 101st Signal Company, the antitank platoon of the 327th Glider Infantry Regiment (GIR), and a surgical team of the 326th Airborne Medical Company. Also accompanying the glider serial in a last-minute change was the assistant division commander (ADC) of