In the first part of this Volume 4, the French fortifications built in the Alps against the Italian threat are fully detailed: how the whole defense was designed, how the main blockhouses were built in the mountains, the specific technical means involved, the Alpine Fortress troops, the complete 1940 orbit and the plans of all mainworks. The June 1940 fighting, leading to the Italian failure, is also featured, as well as the smaller fortifications built in Corsica and Tunisia (Mareth Line

In the first part of this Volume 4, the French fortifications built in the Alps against the Italian threat are fully detailed: how the whole defense was designed, how the main blockhouses were built in the mountains, the specific technical means involved, the Alpine Fortress troops, the complete 1940 orbit and the plans of all mainworks. The June 1940 fighting, leading to the Italian failure, is also featured, as well as the smaller fortifications built in Corsica and Tunisia (Mareth Line