ORDER OF BATTLE // October 7, 1364
Battle of Auray
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 10,000 estimated
House of Montfort
6,000
Medium-confidence figure
House of Blois
4,000
Medium-confidence figure
Battle context
The Battle of Auray, fought near the Breton town of Auray, was the decisive confrontation of the War of Breton Succession, which had consumed the duchy for over two decades. The conflict pitted the House of Montfort against the House of Blois for control of Brittany, and Auray resolved that contest in favor of Montfort. The engagement ended with heavy losses for the House of Blois, which sustained around 1,000 casualties in a battle where it was already outnumbered, fielding roughly 4,000 troops against Montfort's 6,000. The presence of senior commanders on both sides — John Chandos and John de Montfort for the victors, Bertrand du Guesclin and Charles of Blois for the defeated — underscores the scale and finality of the engagement. As part of the broader Hundred Years' War, the outcome carried significance beyond Brittany, bearing on the contest between England and France for influence over the duchy and its resources.
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