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Origin and history

Fort du Mont-Agel, located in the commune of Peille (Alpes-Maritimes), is a key work of the Maginot line in the fortified area of the Alpes-Maritimes. Perched at 1,130 metres above sea level on Mount Agel, it overlooks the bay of Roquebrune and Monte Carlo. Built between 1931 and 1933 for 23 million francs, it combines underground infrastructures (galleries, ammunition stores, power plant) and eight blocks on the surface, including two 75 mm artillery turrets model 1933. Its role was to cover the Mediterranean coast and the surrounding valleys against an Italian invasion, in support of the works of Sainte-Agnès, Roquebrune and Cap-Martin.

The structure is part of a defensive device in depth: light outposts near the border, main line of resistance (with concrete structures like that of Sainte-Agnès), and artillery positions in retreat. Mount Agel, equipped with a cable car for refuelling (1,822 m long, 480 m of elevation), could store 6,400 75-mm shells and withstand shelling thanks to concrete slabs 2.5 to 3.5 m thick. His crew in 1940 consisted of 194 soldiers and 7 officers from the 86th Alpine Battalion in Fortress and 157th Regiment in Artillerie de Position.

During the Second World War, the fort played an active role in the fighting in June 1940 against the Italian army. Its turrets fired 3,000 shells in 12 days, targeting enemy troops at Menton, Roquebrune, and an Italian armored train near Cape Mortola. On 24 June, a 155 mm gun installed on the plateau burned an ammunition train at Vintimille station. After the Armistice, the work was disarmed and occupied successively by the Italians (1942) and then the Germans (1943-1944), who used it as an artillery position against the Allies after the landing of Provence.

Starting in 1953, the site was integrated into an aerial radar detection base, now dependent on Base 125dIstres. Two radômes were installed, and the turrets, intact, were covered with sheet metal. The cable car, disturbed by the broadcasts of Radio Monte-Carlo, was abandoned in 1965. Today, the plateau remains a publicly prohibited military area, protected by air commandos rifles. Underground galleries, although emptied of their equipment, retain their turrets and original infrastructure.

The ensemble also includes a former fort Séré de Rivières (1888-1892), a white limestone polygonal shed lined with a 3 km escarp, as well as artillery training boxes. These elements, combined with open-air artillery positions (220 mm and 155 mm canons), illustrate the evolution of French defensive strategies from the late 19th century to the Second World War.

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