The Fortified Sector of the Vosges (Secteur Fortifiée des Vosges) was the French military organization that in 1940 controlled the section of the Maginot Line at the northern end of the Vosges Mountains in northeastern France. The sector was bordered to the west by the Fortified Sector of Rohrbach and to the east by the Fortified Sector of Haguenau. The sector featured two gros ouvrages mounting heavy artillery at either end of the sector and one petit ouvrage mounting infantry weapons, linked by a line of casemates. The sector was attacked in 1940 by German forces in the Battle of France. German forces penetrated the casemate line and moved behind French lines. Despite the withdrawal of the mobile forces that supported the fixed fortifications, the three ouvrages successfully fended off G