The Fort de Liouville, also known as Fort Stengel, located between the communes of Saint-Agnant-sous-les-Côtes and Saint-Julien-sous-les-Côtes, near the town of Commercy in the Meuse departement of France, is one of the forts built at the end of the 19th century to defend the valley of the Meuse. The fort was located on what was then the French frontier facing the German-occupied province of Lorraine. The Fort de Liouville was located between the Fort de Gironville and the Camp des Romains.