Concentric Castles

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'Concentric' literally means circles one inside another.

A concentric castle has rings of walls one inside another. The inner walls and towers are higher than the outer ones, so that archers on the inner walls could shoot at attackers outside the outer walls.

If the attackers succeeded in getting through the outer wall, they would then find themselves trapped between the inner and outer rings.

Other examples:
Beaumaris, Tower of London

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