The sector was created in 1940 as part of the reorganization of the Meuse Front, which was combined with the Maginot Montmédy Bridgehead (Tête du Pont de Montmédy) and the Defensive Sector of Marville, itself separated from the Fortified Sector of the Crusnes. As a result, the fortifications in the new sector represent a wide variety of types and degrees of fortification. The Sedan sub-sector comprises two distinct lines, with fortified houses close to the border and a line of blockhouses along the line of the Meuse. The houses were built in 1938 by the Military Works organization (Main d'Ouevre Militaire (MOM)), while the blockhouses were built primarily by the Army Engineer Service (Service Technique du Génie (STG)), beginning in 1936. The Mouzon sub-sector was organized similarly. A num