This earthwork, now of very linear form, is allegedly of prehistoric date and represents a Bronze Age burial mound. There are certainly several monuments of similar origin in the locality - particularly on Peel Hill - and the name associated with it - the Giant's Grave - suggests that a substantial burial cist may have been observed, though no record of such a discovery is known.


The earthwork's linear nature, and relationship with the defences behind it, suggest that it may have an alternative, and more recent, origin as a medieval rampart.