curtain wall
Sign in to savedefensive wall between two towers of a castle, fortress or town
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Encyclopedic overview
Beaumaris Castle in Anglesey in North Wales, with curtain walls between the lower outer towers, and higher inner curtain walls between the higher inner towers.
A curtain wall is a defensive wall between fortified towers or bastions of a castle, fortress, or town.
Excerpted from Wikipedia’s “curtain wall” article, available under the CC BY-SA 4.0 licence.