Redoubt

A small, and usually a roughly constructed, fort or outwork of varying shape, commonly erected for a temporary purpose, and without flanking defenses, -- used esp. in fortifying tops of hills and passes, and positions in hostile territory.

In permanent works, an outwork placed within another outwork. See F and i in Illust. of Ravelin.

To stand in dread of; to regard with fear; to dread.

an entrenched stronghold or refuge

(military) a temporary or supplementary fortification; typically square or polygonal without flanking defenses