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circular rampart
A circular rampart (German: ''Ringwall'') is an embankment built in the shape of a circle that was used as part of the defences for a military fortification, hill fort or refuge, or was built for religious purposes or as a place of gathering.
The period during which these structures appeared stretches from the Neolithic to the Middle Ages.
==Construction==
The key feature of a circular rampart is the embankment forming the primary means of the defensive fortification. It can be constructed in various ways: as a simple earth embankment, as a wood and earth structure or as a wall. Circular ramparts usually have a moat or ditch in front of them; the embankment can be enhanced with a wooden palisade. Often several concentric rings were built, which produced a more effective defensive position against attackers. The interior of such sites often shows evidence of buildings such as halls, barns and other secondary structures.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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