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Two-gun fortification, built 1813, extensively modified, c. 1870. Roughly triangular in shape; mass concrete scarp walls to sunken yard and vaulted subterranean chambers and passageways. Rampart to north and north-west with irregular line taking form of low cliff comprising squared coursed granite rubble walls, surmounted by concrete terreplein, to inside of yard with cast-iron rails and pulleys. Right-angled trench to south and west with sloping concrete glacis incorporating ravelin redoubt trench; defence blockhouse to south-west angle. Yard entered from south-west through chamfered segmental-arch headed gateway, formerly with double battened timber doors. Segmental-arched niches with hoodmouldings around yard. Detached six-bay single-storey block-house to south of yard comprising of flat concrete roof, smooth rendered walls with English garden wall bond brick and dressed squared stone, square-headed window openings with bullnose reveals, casement windows with top-hung lights and ashlar granite lintels, square-headed door openings. Platform to rear of blockhouse, with tooled ashlar granite retaining walls and parapet to south. Cogged runner cast-iron gun mounts to north of yard enclosed by rounded concrete wall. Single-storey concrete blockhouse to north of yard. Concrete stairways to north and east giving access to subterranean chambers. Brick vaults to magazines. Complex of single-storey outbuildings to south of battery. Outbuilding to south comprising, flat concrete roof, smooth rendered walls with English garden wall bond brick and dressed squared stone, square-headed window openings with bullnose reveals and horned timber sash windows. House to south of battery comprising pitched fibre cement tiled roof with smooth rendered chimneystack, and squared course rock-faced walls, square-headed window openings with uPVC windows, and square-headed door opening with replacement battened timber door with glazed overlight. Outbuilding to south-west of battery comprising red brick walls and flat concrete roof. Battery located to north-west of Inch Island, at narrowest point of Lough Swilly opposite Rathmullan.
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