the sector's fortifications were built during the 1930s and saw combat during the italian invasion of france in 1940 and later during the second battle of the alps in 1944. the 1940s actions were successful in holding off the italian invasion, but the surrender of france as a whole left the works in italian occupation. some of the fortifications were renovated in the 1950s, during the cold war, and were finally abandoned by the end of the1960s. some of the fortifications have been maintained as museums, and may be visited.