The incarceration of Charles the Bad increased his popularity, and his supporters demanded his freedom. Normandy roared, many barons renounced the homage paid to the king and turned to the king of England, Edward III. They considered that John the Good had exceeded his rights by arresting a prince with whom he had, however, signed peace. The people of Navarre perceive this gesture as coming from a king who doubts his legitimacy and seeks to eliminate a competitor whose only fault is to defend his rights.
1356 – On May 28, Philip of Navarre, brother of Charles, sends his challenge to John the Good. The Navarrese, especially the Norman lords, went over en bloc to the side of Edward III.
In June, Philip and Geoffrey d'Harcourt, sons of John, received English reinforcements, Henry de Grosmont, Duke of Lancaster, landed in the Cotentin and joined forces with Robert Knowles from Brittany. Lancaster set up camp at Montebourg near Valognes, then bypassed Evreux (taken by the French) and plundered Vernon and the suburbs of Rouen.
On 8 July, John the Good caught up with him at the Eagle with a larger but tired army, and the battle was postponed until the next day. During the night the English fled, Jean then laid siege to Breteuil, which he took after a long siege.
On 18 July, Geoffrey d'Harcourt, in order to avenge his nephew, Jean V d'Harcourt, again allied himself with Edward III, whom he made by a charter, the universal legatee of his fortress of Saint-Sauveur (Cotentin).
On 19 September, at Nouaillé-Maupertuis near Poitiers, the French troops, under the command of John the Good, were defeated by the English troops commanded by the Prince of Wales, nicknamed the Black Prince, son of Edward III. During this battle, the 14-year-old Prince Philip uttered the famous "Father, keep to the right! Father, keep to the left" as he tries to protect his father. John refuses to leave the battlefield where he fought heroically and where he was eventually taken prisoner. The tactical superiority conferred by the longbow, used by the English, forced the French cavalry, whose mounts were not protected, to charge on foot and risked being swept away by the English cavalry.
In November, surrounded by French troops at the ford of Saint-Clément, in the Bay of Veys, Geoffroy d'Harcourt sold his skin dearly by fighting to the death.
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