Ouvrage d’infanterie de Bois-la-Dame, Military fortification in Moselle, France.

The Ouvrage d'infanterie de Bois-la-Dame is a military fortification in Moselle composed of concrete bunkers, gun emplacements, and underground passage systems. The structure was designed to preserve its forest setting while providing comprehensive defensive capabilities for infantry operations.

Built from 1913 to 1916 between forts Driant and Jeanne-d'Arc, the Infanterie-Werk Bois-la-Dame was a German work of the second fortified belt of Metz, part of the Moselstellung planned from 1899 to block a French advance. Work stopped in 1916 and the ouvrage stayed unfinished. In September 1944 the German command integrated it into the defence of Metz, declared a Reich fortress on 2 September 1944.

The fort's German name, Infanterie-Werk Bois-la-Dame, was changed to ouvrage d'infanterie after 1919, when the French army reoccupied it. Its design drew on lessons from earlier Festen: the builders left the surrounding forest standing so the work merged into the woods. The concrete barracks was planned for 350 men, with two flanking casemates, one concrete and one armoured, each fitted with machine guns.

The ouvrage stands in woodland between Fort Driant and Fort Jeanne-d'Arc, reached on foot through the trees; the concrete barracks and two flanking casemates are what remain of an unfinished 1913–1916 build. The site has no visitor facilities, so bring a torch and wear boots for uneven ground and leaf litter.

Construction stopped in 1916 and the work was never finished, so the barracks for 350 men and the two flanking casemates, one of concrete and one armoured, remain as built. The site lies between Fort Driant and Fort Jeanne-d'Arc, and the trees were left standing during the work.