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Heritage classified

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Origin and history

The Fort du Loch was built from 1756, ten years after the English landing, as part of the distant defences of the Port of Lorient. This military monument, located in Guidel in the Morbihan, presents itself as an irregular pentagon surrounded by a wide ditch and a wall pierced by barbacans. Its access was controlled by a drawbridge, and two interior buildings housed troops and ammunition. Although designed for war, it was never used for this purpose.

The fort, built on a terrace 100 metres from the coast, dominates the beaches of Pouldu in the west and Fort-Blocked in the east. Its defensive structures include two V-shaped artillery batteries, semicircular capons, and poternes connected by rack trenches. In 1847, glacis were added to strengthen its protection, partially modifying its original architecture. The fort, owned by an association today, has been listed as a historic monument since June 1, 1960.

Designed for the Duke of Aiguillon, the fort illustrates 18th century military architecture, with granite bellow walls, mâchicoulis heals, and powder shops. Its pentagonal plan and defensive elements reflect the fortification techniques of the time, adapted to coastal topography. Despite its purely deterrent role, it remains a major testimony of Breton military history and the protection of strategic ports under the Old Regime.

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