When Charles duke of Touraine and dauphin had visited his duchies of Berry and Touraine, he marched to Montereau-faut-Yonne with about twenty thousand combatants. Soon after his arrival, he dispatched sir Tanneguy du Châtel, with others of his confidential servants, to Troyes in Champagne, with letters written by himself to the duke of Burgundy. In them he addresses the duke most affectionately on the affairs of the realm, and concludes by desiring that he would come to him at Montereau, where they could more fully discuss what related to public affairs. The duke for some days deferred giving any answer, saying, that the dauphin ought to come to his father the king, and the queen at Troyes, and often remonstrated with Tanneguy how much more proper it would be for him to come thither to discuss all that related to the good of the realm. Sir Tanneguy, upon this, returned to the dauphin with the answer he had received; but in the end, the dauphin and his ministers resolved to remain at Montereau. Sir Tanneguy returned to Troyes, and at length prevailed on the duke to come as far as Bray sur Seine, whither many messages were sent from both sides. The dauphin dispatched to the duke the bishop of Valence, brother to the bishop of Langres, who was one of the duke's principal advisers: his name was Charles de Poitiers. The bishop of Valence, on his arrival at Bray, frequently conversed with the duke, and admonished him to wait on the dauphin, saying, that he need not have any fears or suspicions of mischief happening to him. His brother supported him in these remonstrances, adding, that he might loyally go, and that he would act unwisely if he refused so to do. This bishop, however, was perfectly ignorant of what happened afterward, and gave his advice with the most upright intentions. At length, in consequence of these remonstrances, and the assurances of sir Tanneguy du Châtel, the duke ordered preparations to be made for his departure, and set out from Bray to wait on the dauphin, attended by the bishop of Langres and his council on Sunday the 10th day of September 1419. He was escorted by about five hundred men at arms and two hundred archers, under the command of sir Charles, de Lens admiral of France, and James de la Barne master of the cross-bows. There were many lords in his company, such as Charles eldest son to the duke of Bourbon, the lord de Nouaille brother to the count de Foix, John son to the count de Fribourg, the lord de St George, sir Anthony du Vergy, the lord de Joinville, the lord d'Ancre, the lord de Montagu, sir Guy de Pontailler, and many more.