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Origin and history

The fort of La Conchée, located on a rocky island off Saint-Malo, was built between 1692 and 1695 under the direction of Vauban, a military engineer of Louis XIV. This ambitious project aimed to protect the city from attacks by the English fleet, then at war against France in the framework of the Augsburg League. The island, which was difficult to reach and submerged by the waves, was transformed into a unique casematized fortress, equipped with 48-pound guns capable of covering the Norman pit, a strategic anchorage area for enemy ships.

Vauban and his deputy Simeon Garangeau designed a fort with thick, vaulted walls "to the test of the bomb", capable of resisting enemy fire while sheltering an autonomous garrison for a month. The lower rooms, protected by vaults nearly 2 meters thick, housed powder shops, housing, and even a chapel. As early as 1693, the fort suffered a first British attack, where 65 workers were captured. Two years later, in 1695, he victoriously resisted a massive assault of 100 Anglo-Holland ships, proving his strategic effectiveness.

The fort, completed around 1705, was gradually improved, with accommodation for officers and a terrace armed with cannons. However, his history was marked by successive destructions: damaged by storms in 1820, bombed in 1944 by American artillery (in contempt), then abandoned for 25 years. Since 1989, an association of enthusiasts has undertaken its careful restoration, giving life to this masterpiece of Breton military heritage.

Ranked a historic monument in 1984, the fort of La Conchaeus today bears witness to the expertise of 17th century engineers. Its granite vaults, casemates and innovative ventilation system for the period make it a rare example of maritime defensive architecture. The restoration work, which is still ongoing, aims to preserve this emblematic site, accessible only by boat and subject to the whims of the sea.

The origin of the name Conchea comes from the Latin conchea ("shell"), with reference to the sculptures of the rock. The fort, which is 65 metres long, marries the shape of the island and houses remarkable rooms, such as the torus vault that Vauban described as "the most beautiful of Christendom." Despite the damage suffered in 1944, its structure resisted the shells, demonstrating the solidity of its construction.

Today, the fort is managed by a civil society that continues its restoration, relying on traditional techniques and ancient materials. The visits, although difficult due to the isolation of the site, allow to discover an unknown part of the French maritime history and military engineering of Vauban.

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