TENAIL, TENAILLE
\tˈɛne͡ɪl], \tˈɛneɪl], \t_ˈɛ_n_eɪ_l]\
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In fort. an outwork or rampart raised in the main ditch immediately in front of the curtain, between two bastions. In its simplest form it consists of two faces forming with each other a re-entering angle; but generally it consists of three faces forming two re-entering angles, in which case it is called a double tenaille. Any work belonging either to permanent or field fortification, which, on the plan, consists of a succession of lines forming salient and re-entering angles alternately, is said to be a tenaille.
By Daniel Lyons
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Snake's-head
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