Projecting timber on a tower or wall head to allow defense of the walls base. Similar to Brattice work which was temporary, and machicolation which was masonry.
Temporary protection or security fencing.
A wooden gallery built out from the Battlements that provided additional protection and fighting space at the wall top; replaced in later castles by a Machicolated stone Parapet.
Upper wooden stories on a stone castle wall; the living area; sometimes, a temporary wooden balcony suspended from the tops of walls from which missiles could be dropped.
A temporary wooden balcony suspended from the tops of walls and towers before a battle, from which missiles and arrows could be dropped or fired accurately toward the base of the wall.
Brattices; Wooden boards fitted to parapet used as extra protection for defenders
A hoarding was a temporary wooden (shed-like) construction that was placed on the exterior of the ramparts of a castle during a siege.