Eudes did not follow his father's aggressive policies towards France and proved a worthy ally of king Philip II of France in his wars against John Lackland and the Holy Roman Emperor Otto IV of Germany. He fought bravely against the latter in the Battle of Bouvines, where he lost, according to contemporary chroniclers, two horses beneath him. Eudes was also an important figure in the Crusade against the Cathars. When Philip II refused to get involved, the Duke of Burgundy stepped forward with the support of the local bishops and his vassals and organized the campaign of 1209 against the Cathar strongholds. From 1216 to 1222 he helped Philip II of France and Frederick II, Holy Roman Emperor to bring an end to the War of Succession in Champagne.
In 1199, he married Alice of Vergy (1182-1252), the daughter of Hugues, Seigneur de Vergy by Gillette de Trainel. This marriage produced: