Built around 1804 as part of Britain’s coastal defence network during the Napoleonic Wars, the square stone tower rises 11.45 metres from a shallow, water-collecting depression that often floods both the surrounding area and the tower’s interior. The structure formed a vital link in a chain of over 80 signal stations that stretched clockwise from Dublin Bay to Malin Head, with this particular tower maintaining visual contact with Glen Head station 7.6 kilometres to the north and Carrigan Head 8.7 kilometres to the south-east. When weather permitted, messages could be relayed between these posts using naval signal flags, warning of any approaching French invasion fleet.

The tower’s robust construction reflects its military purpose, with roughly coursed rubble walls oriented to face the cardinal points. The most striking defensive features include two bartizans, small turret-like projections supported by stone corbels at the north and east corners, and a machicolation over the south-west doorway that allowed defenders to drop objects on attackers below. The original entrance sits at first-floor level, once accessed by a retractable ladder for security, though a crude ground-level opening has since been knocked through one of the window openings. Inside, the tower contained a semi-basement (now largely filled with soil), ground floor, first floor and low attic level, with fireplaces and alcoves built into the thick north-east wall. An ingenious square drainage channel in the north corner once carried rainwater from the roof to storage barrels in the semi-basement.

After the threat of French invasion receded following Napoleon’s defeat, the signal station system was abandoned by the mid-1810s, and this tower underwent significant modifications. Several windows were reduced in height or blocked entirely, and the first-floor doorway was similarly altered and partially infilled with coursed stonework. Adjacent to the tower, the grassed-over foundations of a stone hut remain visible, measuring approximately 9 metres by 8.5 metres, though it’s uncertain whether this structure served the signal station’s garrison or belongs to a different period entirely. Today, the tower stands as one of Ireland’s best-preserved examples of Napoleonic-era coastal fortification, its weathered stones bearing witness to a time when invasion seemed imminent and every headland needed watching.