Dunree Fort, Dunree, Co. Donegal

Sunk into a ditch cut around the summit of Dunree Hill, the battered concrete scarp walls still carry their metal railings in places, and at each corner a canted pillbox juts out, its narrow gun embrasures aimed along the line of the wall rather than out to sea. That inward-facing suspicion, of an enemy landing behind the fort and attacking from the land side, is easy to miss until it is pointed out, and then the whole design reads differently: this is a place built to defend itself from two directions at once.

The fort was raised between 1895 and 1897 by British military authorities to guard Lough Swilly, then a significant anchorage for the Royal Navy and, in the strategic thinking of the day, a plausible point of invasion. It replaced, in large part, an earlier Napoleonic-era battery just to the west, built in 1812 to 1813, which was itself altered when the new works went up. The original armament was two 4.7-inch guns, with a third added to the old battery; these were swapped for a fresh pair of 4.7-inch guns in 1906, and again in 1912 for two Mark VII 6-inch guns, which remained the fort's main weapons until it closed in 1945. A near-twin fortification at Lenan Head, to the north, was built around the same time, and together the two forts formed the backbone of Lough Swilly's defence, supplemented by smaller batteries at Inch Fort, Neid's Point, Muckamish, Rathmullan and Knockalla around the lough. As a Treaty Port position, Dunree stayed under British control until 1938, when it passed to the Irish Army; anti-aircraft guns were added during the Emergency, when the fort played its part in guarding Irish neutrality through the Second World War.

Approach is on foot, along pathways with intermittent flights of concrete steps leading up from the former barracks complex to the west. Inside, the redoubt is entered through a two-storey gatehouse at the north-west, its ground floor brick-walled and barred at the windows, concrete stairs beyond leading up into the fort proper. To the west and north, outside the main redoubt wall, circular gun emplacements sit on raised concrete platforms known as terrepleins, looking out over the lough and the sea approaches beyond; beside them, sunken magazines still hold their pulley mechanisms, and vaulted chambers, built into the wall itself and roofed over with earth, run along the boundary. Some outbuildings on site, corrugated-metal sheds and a concrete-roofed store, have fallen into disrepair, alongside sunken water tanks that once served the garrison.