The hill was fortified in the late fourth century BC, the ramparts enclosed an area of . It was triangular in form but most of the eastern section was looted to be used in lime kilns. It consisted of a dry limestone wall. There were three gateways, one to the north, south and east. The western section of the wall, cleared in 1974, revealed 24 bastions. These were originally rectangular but were replaced in the mid-third century BC with rounded ones. Two of the towers were substantially higher; these were built as watch towers and for prestige. The ramparts were abandoned in the first century AD.