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of the wall than the outside. The outside was made as narrow as possible (slightly wider than the muzzle of the weapon intended to use it) so as to afford the most difficult possible shot to attackers firing back, but the inside had to be wider in order to enable the weapon to be swivelled around so as to aim over a reasonably large arc.

Variations

A distinction was made between horizontal and vertical embrasures or loopholes, depending on the orientation of the opening formed in the outside wall. A vertical loophole—which

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