Coucou is a petit ouvrage English-language sources use the French term ouvrage as the preferred term for the Maginot positions, in preference to "fort", a term usually reserved for older fortifications with passive defenses in the form of walls and ditches [REF].
Block 2: infantry block with two GFM cloches, one retractable machine gun turret, two machine gun embrasures and one 47mm anti-tank gun (JM/AC47) embrasure [REF].