A hillfort which was surrounded by a number of ditches and ramparts, which were either built originally as a multivallate hillfort or had a number of ditches and ramparts added, thus a univallate or a bivallate hillfort could develop into a multivallate hillfort. This development in hillfort design was made necessary by the importation of the sling to Britain, the sling which had a longer range compared to that of the throwing spear. This made it necessary to keep the enemy further away from the principle defences, this was achieved by extending the outworks. This however, does not suggest that all univallate hillforts pre-date all multivallate hillforts. See hillforts.
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