redoubt

Noun
  1. (military) a temporary or supplementary fortification;
    Typically square or polygonal without flanking defenses (synset 104073588)
    referred to in: armed forces, armed services, military, military machine, war machine - the military forces of a nation
    is a type of: fortification, munition - defensive structure consisting of walls or mounds built around a stronghold to strengthen it
  2. An entrenched stronghold or refuge (synset 104073500)
    is a type of: fastness, stronghold - a strongly fortified defensive structure

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