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1380 campaign of the Earl of Buckingham

In July 1380, the Earl of Buckingham commanded an expedition to France to aid England's ally, the Duke of Brittany. The French refused battle before the walls of Troyes on 25 August; Buckingham's forces continued their chevauchée and in November laid siege to Nantes. The support expected from the Duke of Brittany did not appear and in the face of severe losses in men and horses, Buckingham was forced to abandon the siege in January 1381. In February, reconciled to the regime of the new French king Charles VI by the Treaty of Guérande, Brittany paid 50,000 francs to Buckingham for him to abandon the siege and the campaign.