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Origin and history

Fort du Saint-Eynard, also known as Fort Seras, is a military fortification built into the defensive belt of Grenoble, designed to protect the city and its surroundings. Located at 1,338 metres above sea level on Mont Saint-Eynard, it dominated the valley and monitored access from Savoie via the Pass de Porte. Built between 1873 and 1879 under the supervision of Richard de Régnauld de Lannoy de Bissy, it follows the plans of General Séré de Rivières and Colonel Cosseron de Villenoisy, as part of a network of seven forts designed to secure Grenoble.

The fort extends over 274,410 m2, with a built-up surface of 65,000 m2 organized into four V-shaped buildings, housing up to 476 soldiers. Equipped with 25 artillery pieces (including 155 mm guns and 220 mm mortars), it was designed to withstand extended seats, with infrastructure such as a bakery, infirmary and optical telegraph. Despite its strategic role, it was never used in combat, rendered obsolete by aviation during the Second World War.

Built by 300 Italian workers and 115 military personnel, the fort cost 1,155,833 francs, using local limestone and lime produced at Sappey-en-Charteruse. The land, purchased for 17 167 francs, belonged mainly to the municipality of Sappey. The fort was downgraded in 1962, then bought by the municipalities of Sappey and Corenc in 1963 for 60,000 francs. Left behind, it was restored from 1991 by a private company, with the support of the municipalities and the Bâtiments de France.

Today, the fort houses a mountain restaurant and a museum, open from May to November, as well as a historic space highlighting its exceptional heritage and panorama. The revenues generated by these activities finance its maintenance. Since 1998, it has also hosted exhibitions by French and international artists, contributing to its cultural revitalization.

Although designed to counter an invasion by the Chartreuse or Gresivaudan, its real orientation and evolution of military technologies (such as aviation) have limited its practical usefulness. However, it remains a major testimony to the defensive architecture of the 19th century and a tourist site popular for its history and views of the Alps.

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