Redoubt

Let them hole up in the redoubt -- our troops will pass right by.

Source: tatoeba (8965560)

2014, Paul Salopek, Blessed. Cursed. Claimed., National Geographic (December 2014)https://web.archive.org/web/20150212214621/http://ngm.nationalgeographic.com/2014/12/pilgrim-roads/salopek-text To the south, the vast geometrical deserts of Arabian nomads, a redoubt of feral movement, of fickle winds, of open space, of saddle leather—home to the wild Bedouin tribes.

Source: wiktionary

By the time that our troops had taken a little refreshment, a quantity of intrenching tools were brought a-shore, and the regiments were employed in redoubting our ground, and landing some cannon and ammunition.

Source: wiktionary

I have been employed from the day of action to that of the capitulation, in redoubting our Camp beyond insult

Source: wiktionary