The Battle of Poitiers was a battle between which two nations?

The Battle of Poitiers was a major English victory in the Hundred Years' War. It was fought on 19 September 1356 in Nouaillé, near the city of Poitiers in Aquitaine, western France. Edward, the Black Prince, led an army of English, Welsh, Breton and Gascon troops, many of them veterans of the Battle of Crécy. They were attacked by a larger French force led by King John II of France, which included allied Scottish forces.

The French were heavily defeated; an English counter-attack captured King John II along with his youngest son and much of the French nobility. The effect of the defeat on France was catastrophic, leaving Dauphin Charles to rule the country. Charles faced populist revolts across the kingdom in the wake of the battle, which had destroyed the prestige of the French upper-class. The Edwardian phase of the war ended four years later in 1360, on favourable terms for England.