A detached work with two embankments which make a salient angle. It is raised before the curtain on the counterscarp of the place. Formerly called demilune and half-moon.
A large V-shaped outwork (usually outside the moat/ditch) that protects the gate or other weak point of a fort or castle.
An outwork consisting of two faces forming a salient angle at the front and a flank angle to the rear which was usually closed at the gorge. Ravelins were separated from the main body of the place by ditches and functioned to protect curtains.
Triangular outwork, built in a ditch of a fort to split the attacking force and cause confusion.
Fortified structure, more or less triangular in plan, sited in the ditch to defend the curtain.
Outwork with two faces forming a salient angle; like in a star-shaped fort.
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.
([or demi-lune]: an outwork on the far side of the ditch or moat of a fortification and located between two bastions. Built in the shape of an arrowhead, facing away from the fortification, with an opening towards the wall; defensive purpose was to protect the ground in front of the main fortification.
A work constructed beyond the main ditch, opposite a curtain, composed of two faces and forming a salient angle. It has its own ditch and usually a counterscarp. Alternately called a demi-lune.
This was a small earthwork, an outwork with only two faces, sometimes like a Flche.
An exterior fortification with two embankments or walls projecting outwards and forming a salient angle.
a detached earthwork open to the rear with two long faces forming a salient angle and two short flanks. See Detached Works.
A ravelin is a triangular fortification, detached outwork in front of the bastions. Originally called a demi-lune, lunette, (semidetached outwork) the ravelin is placed outside a castle opposite a fortification curtain. The edges of the ravelin are placed so that the guns there can sweep fire upon the troops that have to run along the fortification curtain.