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Heritage classified

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Origin and history

Fort Belin, located in Salins-les-Bains in the Jura, rises to 594 m above sea level on a rocky spur overlooking the city. Its origins date back to the Middle Ages with the Châtelbelin, a castle in ruins since 1628, replaced by fortifications designed by Vauban after the French annexation of Franche-Comté in 1674. The site then includes a dread (Grelimbach), a fortified hermitage (bas-Belin), and a horned work typical of 17th century bastioned architecture.

Shaved by the Austrians in 1814 after the siege of Salins, the fort was rebuilt between 1828 and 1855 under the direction of General Haxo. The works modernize the rider, add protected casemates, and restore Grelimbach's dread with caponhole ditches. The fort, armed with 28 guns in 1871, resisted the Prussians during the Franco-Prussian war, slowing down their advance towards Pontarlier. Declassified at the end of the 19th century, it was ceded to the city in 1921 before being classified as a historical monument in 1984.

The architecture combines Vaubanian elements (horned work, ditches, counterscarps) and 19th-century layouts such as vaulted casemates, an optical telegraph post (linked to Besançon and Dijon), and a floor-to-floor interior cabinet. Grelimbach's dread, a stone square, serves as the main entrance with a vaulted gallery and a caponière. The lower Belin, a former hermitage, houses a shell-proof barracks, connected by a creneled staircase. The site, now privately owned in the process of restoration, has also been used as a setting for films such as Trop (pure) d'amour (1998).

Fort Belin illustrates the evolution of defensive strategies from Vauban (war of siege) to the adaptations of the 19th century (artillery, optical communications). Its role during the 19th century conflicts — resistance to the Prussians in 1871, siege hospital in 1813 — underscores its geographical importance in the Cluse of Salins. After his downgrading, he briefly welcomed holiday colonies (1970s) before being rented through an emphyteotic lease. Medieval remains (the Grimbert Tower) and the Vaubanian foundations coexist with 19th-century structures, testifying to nearly a thousand years of military history.

Ranked as historic monuments in 1984, the fort includes three protected elements: the fort itself, the Grelimbach dread, and the lower Belin with their connections (covered path, ditches). The partially preserved plans of Vauban show a bastioned front adapted to the relief, with natural cliffs to the north and west. The 19th-century restorations preserved the original platforms while adding innovations such as counterscarp galleries or shelter ties. Today, the site remains a remarkable example of hybrid military architecture, mixing medieval heritage, Vaubanian genius, and post-Napoleonian modernizations.

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