In 1476–1477, he fought alongside Charles the Bold at the three great battles of Grandson, Murten and Nancy, and was taken hostage at the end of the latter by René II, Duke of Lorraine, and delivered to the King of France, who was anxious that Burgundy should never again rebel. But Antoine had no interest in making trouble, and he offered Louis his services to help stabilize the precarious political situation. He was instrumental in arranging the marriage of Duchess Mary, his niece and only child and successor of Charles the Bold, to Maximilian of Austria.