What looks at first like a coastguard station is, underneath its later additions, one link in an early nineteenth-century coastal alarm network that once stretched the entire way around Ireland, built in urgent anticipation of a French fleet that never came.

The British Board of Ordnance erected more than eighty of these signal stations between roughly 1804 and 1805, forming a continuous chain from Dublin Bay clockwise around the coast to Malin Head in County Donegal. The idea was straightforward: a naval signal post at each tower could relay warning of an approaching invasion fleet from station to station within minutes. The mast at Gortacrossig was in place by 1804 and the tower completed the following year, according to research by Paul Kerrigan. In its original form the building would have been two storeys over a partial raised basement, with a doorway at first-floor level protected by a machicolation, a projecting parapet opening through which defenders could drop or pour things onto anyone forcing the door, and small bartizans, corbelled corner turrets, at the rear. The threat of invasion faded by the mid-1810s and the chain was abandoned. When the Irish Coastguard Service was established in 1822, Toe Head was apparently among the first stations to be taken over and converted. That conversion accounts for much of what survives today: a third storey was added, the bartizans and machicolation were removed, a crenellated parapet was installed on moulded stone corbels, new window openings were cut, and a substantial two-storey addition was built against the rear elevation, itself later acquiring a small single-storey outbuilding. The 1841 to 1842 Ordnance Survey map shows the building already in this enlarged form. The nearest surviving comparable tower in the original chain stands at Ballylinchy near Kedge Point, roughly 9.4 kilometres to the south-west, while the station at Reenogrena near Glandore, about 11.5 kilometres to the north-east, has been demolished entirely.

Within the rubble stone enclosure that surrounds the tower, a further layer of history is quietly present: a World War II-era Lookout Post, LOP 28, sits roughly 18 metres from the tower's south-west wall. Ireland's Emergency-period marine observation posts, manned by the Coast Watching Service between 1939 and 1945, were themselves a kind of echo of the earlier signal chain, scanning the same waters for a different kind of threat. The co-location of structures from 1805, the 1830s, and the 1940s on a single modest ridge above the west Cork coast gives the site an odd, layered quality that its quiet surroundings do little to advertise.