When Louis was under the necessity of abandoning the field at Montlhéry to the heir of Burgundy, Normandy revolted to the insurgent princes; and the king, finding himself the weaker party, had recourse to dissimulation. He expressed his readiness to negotiate, pretended to forget his resentment, surrendered Normandy to his brother, satisfied the demands of the Count of Charolois, and named the Count of St. Pol Constable of France. But this treaty negotiated at Conflans having, at the king's desire, been annulled by the States-General, Louis avenged himself by depriving Charles de Valois of Normandy, and stirring up the rich cities of Flanders to revolt against Charolois, now, by his father's death, Duke of Burgundy, and, by his second marriage, brother-in-law to Edward of York. At the time when Louis was inciting the Flemings to revolt against their sovereign, and when he had an emissary in Liége for that purpose, he endeavored to avert suspicion from himself by paying a visit to Charles the Rash, at Peronne. This piece of diplomacy well-nigh cost his life. Scarcely had the king arrived at Peronne ere intelligence followed of the revolt at Liége; and Burgundy was exasperated in the highest degree to learn that the populace had proceeded to horrible excesses, massacred the canons, and murdered the bishop, Louis de Bourbon, his own relative. But when, in addition to all this, Burgundy heard that the king was the author of the sedition, his rage knew no bounds. He immediately committed Louis to prison, menaced the captive with death, and appeared determined to execute his threat. Louis, however, became aware of his peril, and submitted to all that was demanded. To extricate himself from danger he signed the treaty of Peronne, divesting himself of all sovereignty over Burgundy, giving his brother Champagne and Brie, and finally engaging to march in person against the insurgents of Liége. The treaty of Peronne restored Louis to liberty, but not till he had played a part that must have tried even his seared conscience. He was under the necessity of accompanying Burgundy to Liége, witnessing the destruction of the unfortunate city, beholding a general massacre of the men whom he had incited to revolt, and even congratulating Charles the Rash on having executed vengeance. All this time, however, Louis had no intention of maintaining the treaty of Peronne. Indeed, he only awaited a favorable opportunity of breaking faith; but he deemed it policy to proceed cautiously, for the alliance of Burgundy with Edward of York rendered the duke formidable in his eyes.