By the time a revised edition appeared in 1908, the same feature was rendered as little more than an arc of hachures, the cartographic shorthand for a slope or embankment. Today even that is gone, cleared away in 1933 during agricultural work. What the clearing uncovered, though, made the loss of the earthwork rather beside the point.

The fort sat at the north-western summit of a low ridge running roughly 150 metres from north-west to south-east. The earthwork itself was oval in plan, measuring approximately 55 metres on its north-east to south-west axis and around 45 metres across. When it was removed in 1933, workers discovered a souterrain beneath it. A souterrain is an artificially constructed underground passage or chamber, typically associated with early medieval settlement in Ireland, and often interpreted as a place of refuge, storage, or both. A survey description recorded in 1968 noted that what remained of the fort by that point was a roughly rectangular area defined by a scarp, a steep earthen face reaching up to 1.8 metres in height at its north-eastern end, curving around from south through north to east before merging into the natural slope of the ridge. The relationship between the earthwork and the souterrain below it suggests this was once a more complex site than its modest ridge-top setting might imply, a small enclosed settlement whose above-ground traces were quietly dismantled before anyone thought to look underneath.