Upon the morning after the battle Don Pedro requested the Black Prince to give him up all the Castilian prisoners, in order that he might put them to death. The prince, however, was always opposed to cruelty, and asked and obtained as a boon to himself that the lives of all the Spanish prisoners, with the exception of one whose conduct had been marked with peculiar treachery, should be spared, and even induced Pedro to pardon them altogether on their swearing fealty to him. Even Don Sancho, Pedro's brother, who had fought at Najarra under Don Henry, was received and embraced by Pedro at the request of the Prince of Wales. The city of Burgos at once opened its gates, and the rest of the country followed its example, and resumed its allegiance to Pedro, who remounted his throne without further resistance. As Walter had fought by the side of the Black Prince his desire to cross swords with Du Guesclin was not satisfied; but his valour during the day won for him the warm approbation of the prince. Opposed to them were many of the great companies, and these men, all experienced soldiers and many of them Englishmen, had fought with great stubbornness. Walter had singled out for attack a banner bearing the cognizance of a raven. The leader of this band, who was known as the Knight of the Raven, had won for himself a specially evil notoriety in France by the ferocity of his conduct. Wherever his band went they had swept the country, and the most atrocious tortures had been inflicted on all well-to-do persons who had fallen into their hands, to extract from them the secret of buried hoards or bonds, entailing upon them the loss of their last penny. The Knight of the Raven himself was said to be as brave as he was cruel, and several nobles who had attempted to oppose his band had been defeated and slain by him. He was known to be English, but his name was a mystery; and the Black Prince and his knights had long wished to encounter a man who was a disgrace alike to chivalry and the English name. When, therefore, Walter saw his banner in the king's division he urged his horse towards it, and, followed by Ralph and some thirty men-at-arms, hewed his way through the crowd until he was close to the banner. A knight in gray armour spurred forward to meet him, and a desperate conflict took place.