A bastion which, instead of a point, has a re-entering angle.
Related term(s): Bastion; Bastion, Composed; Bastion, Deformed; Bastion, Demi; Bastion, Double; Bastion, Flat
Category: Castles and Fortifications
Source information: Wilhelm, Thomas. A Military Dictionary and Gazetteer. Philadelphia: L.R. Hamersly & Co., 1881. 48.