In the early 1470s he led royal military campaigns together with Louis of Luxembourg, Count of Saint-Pol, always under tight instructions from Louis XI. In 1470 he took Amiens from Burgundy. In 1472 he was made Military governor of Paris, and participated in the defense of Beauvais against Charles the Bold. In December 1474, he had the honor of hosting the king and the royal court in his castle of Dammartin; around that time Louis would address him familiarily as his "cousin". On 29 August 1475, he attended the meeting of Picquigny between Louis XI and Edward IV of England, which undermined the Anglo-Burgundian alliance and marked the formal end of the Hundred Years' War. Following Charles the Bold's death in January 1477, still fit to lead militery operations despite his advanced age, he raided Flanders during the War of the Burgundian Succession. He then held the frontline stronghold of Le Quesnoy for more than a year. Louis XI, heowever, replaced him there with in June 1478 as part of a truce in which the king relinquished Hainaut to Maximilian, and episode that crystallized a new deterioration of Chabannes's relationship with the king.