What makes this one quietly melancholy is that the interior, the space the whole structure was built to protect, has largely gone, eroded and collapsed into the sea over the centuries since it was raised.

The antiquarian T. J. Westropp visited and recorded it in his survey published between 1914 and 1916, describing a deep curved fosse cut across the neck of the headland and a fenced interior that measured roughly 69 feet in each direction, nearly circular in plan. The earthworks that survive are still substantial by any measure. The main bank stands 4.7 metres high, the fosse in front of it reaches a depth of 4.1 metres, and beyond that lies a counterscarp bank, a secondary low ridge on the outer lip of the ditch, rising to 1.3 metres. Together these elements formed a layered defensive barrier that would have made the neck of the promontory genuinely difficult to cross. The fosse Westropp described as curved rather than straight, suggesting the builders shaped it to follow the contours of the ground and maximise the obstacle it presented.