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.
The Bessin is an area in Normandy, France, corresponding to the territory of the Bajocasses tribe of Gaul who also gave their name to the city of Bayeux, central town of the Bessin.
The territory was annexed by the count of Rouen in 924.
The Bessin corresponds to the former diocese of Bayeux, which was incorporated into the Calvados département following the French Revolution.
Part of the Bessin is now administered as a national park for its importance as marshland.
Coordinates: 49°20′00″N 0°37′00″W / 49.3333°N 0.616667°W / 49.3333; -0.616667