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Origin and history

Fort Carré was built between 1686 and 1696 at Fort Louis, at the request of Louis XIV, to strengthen the French border along the Rhine. Designed by Vauban and Jacques Tarade, it was integrated into a defensive system that included an urban enclosure, two strong annexes (D'Alsace and the Marquisat) and a new city built ex nihilo in the south. Materials, such as Haguenau stones, were reused, supplemented by local bricks made in Roeschwoog and Neuhaeusel.

The fort adopts a rectangular plan with four straight flanked bastions, four half moons and a glacis surrounded partially by water. Its main access, located on the city side (south front), was protected by underground and surface covers. The garrison, up to 2,000 men, occupied unhealthy barracks, while the administrative buildings and the governor's house were concentrated near the entrance. Stores and warehouses were located between the fort and the city.

In the 18th century, hydrological changes (creating ditches) were introduced to feed moat. After the sieges of the 18th and 19th centuries, today there are only remains: walls and ditches of Fort Carré and Fort d'Alsace. The site, originally island on the Rhine, is now on land, 1.5 km from the river, after the river redevelopments of 1842-1876.

Fort Carré illustrates Vauban's military architecture, combining defensive innovation and urban integration. Its decline reflects the geopolitical and hydraulic transformations of the region, marking the end of its strategic role after the 19th century.

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