The successor to a fear of the end of the 17th century, a fort was built between 1777 and 1779  on the dreary Mire to 119 m above sea level. This rectangular structure is protected by an earthen mortar masonry enclosure. It has barracks for 45 men and two tanks collecting rainwater. Its armament consists of two cannons and three mortars intended to protect the Whale Pass and the Terre-de-Haut roadstead.
