From Longman Dictionary of Contemporary Englishredoubtre‧doubt /rɪˈdaʊt/ noun [countable] formal a small hidden place, for example where soldiers hide themselves when they are fighting
Examples from the Corpus
redoubt• Well-concealed redoubts were guarded by a triple barrier of barbed wire, fifty yards deep.• Enemy redoubts were strewn with booby traps as a matter of course.• The redoubt of the Seven Pines is surrounded, and its defenders die bravely.. 