The site was surveyed by CORF (Commission d'Organisation des Régions Fortifiées), the Maginot Line's design and construction agency; Coume was approved for construction in May 1931.

[1] The petit ouvrage[nb 1] was to receive a separate entry block in a second phase, never carried out.

[5] In addition to the connected combat blocks, a series of detached casemates and infantry shelters surround Coume Annexe Sud, including The 1940 manning of the ouvrage under the command of Captain Faucoulanche comprised 194 men and 5 officers of the 160th Fortress Infantry Regiment.

[10] The Casernement de Ban Saint-Jean provided peacetime above-ground barracks and support services to Coume Annexe Sudand other positions in the area.

[4][11] Coume Annexe Sud played no significant role in either the Battle of France in 1940 or the Lorraine Campaign of 1944.