Ravelin - In military architecture, an outwork formed of two faces of a salient angle and constructed beyond the main ditch and in front of the curtain wall.
Ravelin - Leonardo da Vinci ...
ravelin
In military architecture, an outwork composed of two faces, forming a salient angle whose gorge resembles a half-moon; often refers to any outwork near a fort.
Rayonnant style ...
Ravelin - Outwork with two faces forming a salient angle; like in a star-shaped fort.
Rear-arch - Arch on the inner side of a wall.
Redoubt - Small self-contained fieldwork, a refuge for soldiers outside the main defenses.
Ravelin: A detached outwork developed from the demilune, consisting of a triangular work with two embankments raised before the counterscarp, the work itself was isolated in the ditch of moat.
Caponnière - covered passage across a ditch to an outer fortification structure such as a ravelin.
Carotid - heart-shaped.
Casemate - covered chamber for musketry or artillery.
to attack the walls, and improvements in methods of siegecraft ultimately compelled the defender to develop the enceinte from its medieval form of a ring wall with flanking towers to the 17th century form of bastions, curtains, tenailles and ravelins, ...
 See also: Frame, Church, Door, Roman, Parapet
  
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