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Origin and history

The fort of the Barbonnet, also named fort Suchet and then the building of the Barbonnet, is an Alpine fortification built on Mount Barbonnet (847 m) in Sospel, Alpes-Maritimes. Its strategic position makes it possible to control the valley of the Bévéra and the Braus pass, thus protecting Nice. The site was fortified in three phases: first between 1883 and 1886 as fort Séré de Rivières, then modernized from 1891 to 1917 with concrete reinforcements, and finally integrated into the Maginot line between 1931 and 1935 as artillery work.

The first construction (1883-1886), led by Captain F. Azibert, responded to the threat of the Triple (altalia-Germany-Austria-Hungary alliance in 1882). The fort, pentagonal and surrounded by ditches, houses a vaulted barracks, artillery platforms, and two Mugin armored turrets (1886-1887) equipped with 155 mm guns. These turrets, known as Jeanne-d Initial weapons include ten 95 mm guns, a 320 mm mortar, and six 150 mm mortars, with a 365-man garrison.

Between 1891 and 1917, the fort was modernized with an underground shop of 54 tons of powder, concrete shelters, and an observatory. During the First World War, his garrison evolved with reservists and then territories, with Italy remaining neutral until 1915. In the 1930s, the fort was integrated into the Alpine Maginot line (the Alpes-Maritime sector): its undergrounds were dug under 12 metres of rock, equipped with railway galleries, generators, and air filtration systems. The surface fighting blocks, protected by 2.5 m thick slabs, house 75 mm guns and 81 mm mortars.

During the Second World War, the fort was occupied by infantrymen of the 95th BAF and artillerymen of the 158th RAP. It entered action from 14 to 25 June 1940, firing 517 75 mm shells and 221 155 mm shells against the Italians. An accident on 22 June 1940, caused by the explosion of a shell in an artillery room, killed two soldiers and injured six. The fort was evacuated on 3 July 1940 and reoccupied by the Italians in 1942 and the Germans in 1943. After the war, he was partially disarmed (1963) but remained visitable, keeping a Mougin turret, 75 mm guns, and underground infrastructure.

The fort illustrates the evolution of French defensive strategies, moving from a Séré de Rivières classical fortification to a modern structure integrated with the Maginot line. Its architecture combines 19th-century elements (fossed, caponnières) and 20th-century innovations (armed concrete, electrical systems, underground galleries). Today it bears witness to Alpine military history and Franco-Italian conflicts from the late 19th century to the Second World War.

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