Ouvrage Mauvais-Bois is a petit ouvrage of the Fortified Sector of the Crusnes on the Maginot Line. It is located between the gros ouvrage Latiremont and the petit ouvrage Bois-du-Four, facing the Belgium/Luxembourg border. The original plan for the position was for two phases of construction, resulting in a gros ouvrage provided with heavy artillery. The increase in tension between France and Germany in the late 1930s caused resources to be diverted elsewhere, and only the first three combat blocks were built. In 1940 the ouvrage was regularly bombarded, but not directly attacked by German infantry. When the French military divested itself of the majority of the Maginot fortifications, Mauvais-Bois was the second to be sold.