Ouvrage Les Rochilles is a lesser work (petit ouvrage) of the Maginot Line's Alpine extension, the Alpine Line, in the high Alps about southwest of Modane. The ouvrage consists of one entry block, two infantry blocks and one observation block. Unusually, it was built by the Main d'Oeuvre Militaire (MOM), rather than CORF (Commission pour l'Organisation des Régions Fortifiées), which built most of the larger positions. The design was by CORF. Work began in 1931, but was not completed by 1940, when it was commanded by Lieutenant Curbaille.