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Heritage classified

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Origin and history

The Mont-Dauphin fort, located in the Hautes-Alpes, was built in the early eighteenth century in a strategic context of defending French borders. It is part of a fortification system designed to lock the road to Italy, in addition to Briançon's forts such as the forts of the Heads, the Randouillet and the Salettes. Its location, on a flat overlooking the left bank of the Durance at 1,440 meters above sea level, makes it a key position for monitoring the Vallon du Fontenil and protecting alpine accesses.

The original project, proposed in 1711 by engineer Tardif as Redoute projected on the plateau, was interrupted by the end of the Spanish Succession War (1713) and the death of Louis XIV. Launched between 1724 and 1734 after the redesign of the borders, the site led to the construction of a permanent fort, named Fort Dauphin in 1729 in honour of the birth of Louis, a dolphin of France and future father of Louis XVI. Renamed Fort Lutin in 1793, he underwent minor changes, including the addition of a powder shop between 1874 and 1877. Decommissioned by the evolution of artillery after 1858, he lost his central role with the construction of new detached forts.

The church of Saint-Louis, integrated into the fortified assembly, was built between 1697 and 1706 under the influence of Vauban, who approved his project during a visit in 1700. Unfinished in 1706, she served as a warehouse during the Revolution before being returned to worship in 1803. Its unfinished parts (nef and transept) were dismantled in 1873 to build casemates, while the bell tower and sacristy underwent several repairs in the 19th and 20th centuries. Ranked a Historical Monument in 1920 for the church, then in 2007 for the entire fort, the stronghold illustrates the military architecture of the Alps and its adaptation to geopolitical issues.

The site, a property shared between the municipality and the State, bears witness to the fortification techniques of the 18th century, combining works of beautiful pink marble from Guilleste and defensive installations designed to resist the assaults. Its successive classification (1920 for the church, 1935 for its land, 1943 for the sacristy, and 2007 for the fort) underscores its heritage importance, both for its historical role and for its landscape integration in the Hautes-Alpes. Today, it offers a remarkable example of the Vaubani heritage in the Southern Alps, marked by continuous adaptations to military needs and political uncertainties.

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