Orillons - Arrowhead bastions.
Oubliette - A dungeon reached by a trap door; starvation hole
Outer Curtain - The wall the encloses the outer ward.
Orillons - Round or squared-off extensions of a bastion's faces, designed to protect its recessed flanks.
Orillons: Arrowhead bastions. Outer Curtain: The wall the encloses the outer ward. Outer Ward: The area around the outside of and adjacent to the inner curtain. Oubliette: A dungeon reached by a trap door; starvation hole.
 See also: Ravelin, Well, Bond, Wattle And Daub, Retaining Wall
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