Earl of Buckingham commanded an expedition to France to aid England's ally the Duke of Brittany. As Woodstock marched his 5,200 men east of Paris, they were confronted by the army of Philip the Bold, Duke of Burgundy, at Troyes, but the French had learned from the Battle of Crécy in 1346 and the Battle of Poitiers in 1356 not to offer a pitched battle to the English so Buckingham forces continued a chevauchée and laid siege to Nantes and its vital bridge over the Loire towards Aquitaine. By January, though, it had become apparent that the Duke of Brittany was reconciled to the new French king Charles VI, and with the alliance collapsing and dysentery ravaging his men, Woodstock abandoned the siege.