Edward the Black Prince compelling Peter of Castile to flee from his kingdom, and in setting up his bastard brother, Henry of Trastámara, as king in his stead. Peter, who was in alliance with Edward III, sent messengers to the Black Prince asking his help, and on receiving a gracious answer at Corunna, set out at once, and arrived at Bayonne with his son and his three daughters. The prince met him at Capbreton, and rode with him to Bordeaux. Many of the prince's lords, both English and Gascon, were unwilling that he should espouse Peter's cause, but he declared that it was not
Edward the Black Prince burnt, and that 3,000 persons of all ranks and ages were massacred. However modern scholarship, including the historian Richard Barber writing in 2008 in the "Oxford Dictionary of National Biography", and drawing on a wider range of evidence, places casualties much lower than Froissart did—around 300 garrison soldiers and civilians in total. The prince returned to Cognac; his sickness increased, and he was forced to give up all hope of being able to direct any further operations and to proceed first to Angoulème and then to Bordeaux. The death of his eldest son Edward, which happened at this time, grieved