The entrance to any piece of a fortification, which consists of the distance or space between the inner extremities of the two faces. For example, a gorge could lie between the faces of a half-moon, redoubt, bastion, redan, lunette, etc.
Related term(s): Fortification; Half-moon; Redoubt; Bastion; Redan; Lunette
Category: Castles and Fortifications
Source information: Wilhelm, Thomas. A Military Dictionary and Gazetteer. Philadelphia: L.R. Hamersly & Co., 1881. 197.