The Fortified Sector of the Sarre (Secteur Fortifié de la Sarre) was the French military organization that in 1940 controlled the section of the Maginot Line on either side of the Sarre river. The sector's defenses relied primarily on a system of inundations that could be created by fortified dikes and regulating weirs, backed by blockhouses. Weakly defended compared with other sections of the Maginot Line, the sector received a measure of attention and funding from the mid-1930s when the formerly demilitarized Saarland was reintegrated into Germany. However, with a single petit ouvrage it remained a weak point in the Line. In 1940 the Sarre sector was attacked by German forces in the Battle of France. The inundations were only partly successful, and German forces were able to pierce the M