Literally, the sides or ends of the fortification. In fortification, the term 'flank' also means any part of the work defending another by a fire along the outside of its parapet.
Related term(s): Flank; Fortification; Parapet; Bastion; Bastion, Demi
Category: Castles and Fortifications
Source information: Wilhelm, Thomas. A Military Dictionary and Gazetteer. Philadelphia: L.R. Hamersly & Co., 1881. 164.