Tour-en-Bessin is a commune in the Calvados department in the Basse-Normandie region in northwestern France.
After the liberation of the area by Allied Forces in 1944, engineers of the Ninth Air Force IX Engineering Command began construction of a combat Advanced Landing Ground outside of the town. Declared operational on 28 July, the airfield was designated as "A-13", it was used by several fighter and bomber units until mid-September. Afterward, the airfield was used for resupply and casualty transport. It was closed in early December.