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Aerial view of the construction principles of the Belgian wall and the opus gallicus. The drawing is in portrait format and has no frame.
The principles of Belgian wall construction are shown at the top of the drawing. A dry-stone wall is placed at the top of a ditch. The ditch is preceded by a compacted earth embankment. The principles of opus gallicus construction are shown in the lower part of the drawing. The construction consists of a stack of horizontally placed beams and a dry-stone facing. Wooden battlements stand at the top. A moat precedes the wall.