Guardia alla Frontiera
The Guardia alla Frontiera (GaF), was an Italian Army Border guard created in 1937 who defended the 1.851 km of northern Italian frontiers with the so-called "Vallo Alpino Occidentale" (487 km with France), "Vallo Alpino Settentrionale" (724 km with Switzerland and 420 km with Austria) and "Vallo Alpino Orientale" (220 km with Yugoslavia).
In 1940 the GaF had 21,000 military personnel, deployed in eight commands, 27 sectors and seven regiments of artillery. It manned 1,000 fortifications, 6,000 machine guns, 1,000 mortars, 100 Cannone da 47/32 M35 , and another thousand other medium and small-caliber cannons (75/27 and 149/35).
The GaF was divided into the following "Corpi d'Armata":
By 10 June 1940 (Italy's entry into the war) the GaF (not counting colonies in Libya and Albania) contained 23 sectors, 50,000 men, 28 battalions "Vallo Alpino", 22 battalions of fascist militia.
Each command of the army of GaF could be divided into "sectors" (27 areas of coverage, from I to XXVII, along the border; sectors XVIII, XIX and XX were never realized), which could break down in "sub" and then in "groups of milestones" and so on for ever smaller units. Each command in the field had two or more subsectors which controlled the fortifications. These works were manned by infantry, artillery, engineers, etc. Despite the GaF was a body predominantly static type, its dependencies were also made five light tank (carristi) companies, equipped with Fiat 3000 that over time, due to their age and lack of spare parts, ended largely abandoned in Sector armories or buried in order to use the turrets as a fort.