Middle Ages
Throughout the 14th century, French kings sought to expand their influence at the expense of the territorial holdings of the nobility. They ran into difficulties when attempting to confiscate the holdings of the English kings in southern France, leading to the Hundred Years' War, waged from 1337 to 1453. Early in the war the English under Edward III (r. 1327–77) and his son Edward, the Black Prince (d. 1376), won the battles of Crécy and Poitiers, captured the city of Calais, and won control of much of France. The resulting stresses almost caused the disintegration of the French kingdom during the early years of the war. In the early 15th century, France again came close to dissolving, but in the late 1420s the military successes of Joan of Arc (d. 1431) led to the victory of the French and the capture of the last English possessions in southern France in 1453. The price was high, as the population of France at the end of the Wars was likely half what it had been at the start of the conflict. Conversely, the Wars had a positive effect on English national identity, doing much to fuse the various local identities into a national English ideal. The conflict with France also helped create a national culture in England separate from French culture, which had previously been the dominant influence. The dominance of the English longbow began during early stages of the Hundred Years' War, and cannon appeared on the battlefield at Crécy in 1346.
Hundred Years' War
In 1348, the Black Death, which had just arrived in Paris, began to ravage Europe. In 1355, after the plague had passed and England was able to recover financially, King Edward's son and namesake, the Prince of Wales, later known as the Black Prince, led a Chevauchée from Gascony into France, during which he pillaged Avignonet and Castelnaudary, sacked Carcassonne, and plundered Narbonne. The next year during another Chevauchée he ravaged Auvergne, Limousin, and Berry but failed to take Bourges. He offered terms of peace to King John II of France (known as John the Good), who had outflanked him near Poitiers, but refused to surrender himself as the price of their acceptance. This led to the Battle of Poitiers (19 September 1356) where his army routed the French. During the battle, the Gascon noble Jean de Grailly, captal de Buch led a mounted unit that was concealed in a forest. The French advance was contained, at which point de Grailly led a flanking movement with his horsemen cutting off the French retreat and succeeding in capturing King John and many of his nobles. With John held hostage, his son the Dauphin (later to become Charles V) assumed the powers of the king as regent.