(1) A field work consisting of two faces and an open gorge. (2) A triangular work situated forward of the main fortification, consisting of two faces and an open gorge, like but larger than a flche. Used to fortify walls when the necessity and expense of constructing bastions wasrequired. A system of fortifications using redans produced a series of serrations, the distance between the redans should not exceed the length of musket shot, so that fire from the faces of a redan will be able to the salients of the neighbouring redans. (Re + L. den, tooth).
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