Bastion
n.
A work projecting outward from the main inclosure of a fortification, consisting of two faces and two flanks, and so constructed that it is able to defend by a flanking fire the adjacent curtain, or wall which extends from one bastion to another. Two adjacent bastions are connected by the curtain , which joins the flank of one with the adjacent flank of the other. The distance between the flanks of a bastion is called the gorge . A lunette is a detached bastion. See Ravelin .
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