Horn-work, in Fortification, is a capacious form of advanced work formerly much used. The head is a bastioned front, and therefore self-flanking, while the sides or branches are flanked from the works in rear. If, instead of a single bastioned front, the work has two bastioned fronts, it is called a Crown-work (q.v.), and if three, a double crown- work. The position of these works is outside the glacis. There were good examples in the old fortifications of Strasburg. See also FORTIFICATION.