The material used to build an earthen wall
for a castle. This material must be harder than that used for residences
in order to withstand bullets and arrows, and to ensure that when a part
of the wall is destroyed, the rest remains stable. The earth wall is reinforced
with round stalks of bamboo, laid vertically and horizontally. The vertical
bamboo stalks are thick; their tops, sharpened like spears, project from
the top of the wall.
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