 The Fort du Télégraphe was completed between 1886 and 1890 as a part of the Séré de Rivières system of fortifications.It saw no action until 1940, when it fired on Italian forces with 155mm guns.The fort was part of the "Second Position" ("Deuxième Position"), a backup to the main fortifications of the modern Alpine Line, the southwestern component of the Maginot Line.