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Counterguard - A long, near-triangular freestanding fortification within the moat.
Counterscarp - Outer slope of ditch.
Course - Level layer of stones or bricks.
Counterguard: An outwork, triangular in shape, open at the rear, situated before the face of a bastion, ravelin or redan, used to protect these works from enemy cannon fire.
 See also: Salient, Well, Splay, Plinth, Retaining Wall
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