Retirata - Improvised fieldwork to counter an imminent breach.
Revetment - Retaining wall to prevent erosion; to face a surface with stone slabs.
Rib - Raised moulding dividing a vault.
Retirata: (1) A work built behind a bastion so as to its strength. (2) An earthwork rampart, raised behind a breach, to enable the garrison to defend the position against storming. See retrenchment.
Retirata - improvised fieldwork to counter an imminent breach.
Retrenchment - interior defence works, usually consisting of a trench and parapet.
Revet - face with a layer of stone for more strength.
 See also: Dungeon, Aperture, Pediment, Enceinte, Church
  
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