Durfort was one of the main vassals of the Duchy of Gascony. On 12 June 1451, he signed as representative of the nobility of Bordeaux, the treaty of capitulation of the city before the French army led by Jean de Dunois, Count of Dunois. The French, anxious to conciliate the inhabitants of the region, offered them favourable conditions and they were permitted to maintain their existing titles and lands. The following year, he returned to the favour of the English, contributing to the return of Bordeaux to John Talbot, Earl of Shrewsbury. In 1453, after the French victory at the Battle of Castillon, the French routed the English forces from Gascony. The Count of Clermont invaded the Medoc and took Castelnau, while other French troops captured Cadillac. The castle of Blanquefort, held by Durfort, was the last to surrender.
