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Machicolation
In architecture, a machicolation (French: mâchicoulis) is an opening between the supporting corbels of a battlement through which defenders can target attackers who have reached the base of the defensive wall. A smaller related structure that only protects key points of a fortification is referred to as a bretèche. Machicolation, hoarding, bretèches, and murder holes are all similar defensive features serving the same purpose: to enable defenders atop a defensive structure to target attackers below.
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