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nd, or entrance into the lower pond. -- Tail of the trenches (Fort.), the post where the besiegers begin to break ground, and cover themselves from the fire of the place, in advancing the lines of approach. -- Tail spindle, the spindle of the tailstock of a turning lathe; -- called also dead spindle. -- To turn tail…

on made during a siege, for the purpose of covering the troops as they advance toward the besieged place. The term includes the parallels and the approaches. To open the trenches (Mil.), to begin to dig or to form the lines of approach. Trench cavalier (Fort.), an elevation constructed (by a besieger) of gabions, fasci…