Bivalate - A hillfort defended by two concentric ditches.
Blockhouse - Small square fortification, usually of timber bond overlapping arrangement of bricks in courses (flemish, dutch, french, etc.) ...
Bivalate - A hillfort defended by two concentric ditches.
Black Asphaltum - A bituminous substance applied to the outside of foundation walls beneath the ground level to waterproof these walls.
Bivalate: A hillfort defended by two concentric ditches. Blind arcade: A row of decorative arches applied to a wall; A 'dummy' arcade. Blind arch: An arch applied to a wall; A 'dummy' arch.
 See also: Parapet, Tower, Bond, Church, Brick
  
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