In architecture, a machicolation () is an opening between the supporting of a battlement through which defenders could target attackers who had reached the base of the defensive wall. A smaller related structure that only protects key points of a fortification are referred to as Bretèche. Machicolation, hoarding, bretèche, and murder holes are all similar defensive features serving the same purpose, that is to enable defenders atop a defensive structure to target attackers below. The primary benefit of the design allowed defenders to remain behind cover rather than being exposed when leaning over the parapet. They were common in defensive fortifications until the widespread adoption of gunpowder weapons made them obsolete.
Machicolations were more common in French castles than English, where they are usually restricted to the gateway, as in the 13th-century Conwy Castle. Within France, machicolation is more common on southern castles. One of the oldest extant examples of machicolation in northern France is at Château de Farcheville which was built from 1290 to 1304.
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