According to Coflein a 'Defended Enclosure' - or hillfort, if you prefer - once stood beside the Bronze Age round barrows to the north of the road:
'Cropmarks recorded during RCAHMW aerial reconnaissance on 27th July 2006 show the remarkable traces of a large oval, bivallate defended enclosure measuring approximately 216m NW/SE by 126m SW/NE, enclosing some 2.02 hectares. This joins a wider complex which includes a banjo enclosure to the south-east (NPRN 410167) and a summit cemetery of Bronze Age round barrows.