This coastal fortification represents a type of defensive structure particularly common along Ireland's Atlantic shores, where steep cliffs and rocky headlands provided natural protection on multiple sides. The builders only needed to construct ramparts and ditches across the neck of land connecting the promontory to the mainland, creating an easily defensible position with commanding views over both land and sea approaches. The fort likely dates to the Iron Age or early medieval period, when such defensive sites dotted the Irish coastline, serving as refuges for local communities and their livestock during times of conflict.