A musket port set into the plastered wall or tower of a Japanese castle. In section a port was funnel shaped, the larger part on the inside gave a greater field of fire to the defenders, while the narrower aperture on the exterior provided protection to the defenders from incoming fire. The tepposama came in a number of shapes; rectangular, triangular and circular. The ports of the plastered walls onthe ishigaki were left open while those of a wall tower were often provided with shutters, since they were put to other uses other than defence (eg. storehouses or residences).
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