In 1324, Charles IV of France and Edward II of England fought the short War of Saint-Sardos in Gascony. The major event of the war was the brief siege of the English fortress of La Réole, on the Garonne. The English forces, led by Edmund of Woodstock, Earl of Kent, were forced to surrender after a month of bombardment from the French cannons, after promised reinforcements never arrived. The war was a complete failure for England, and only Bordeaux and a narrow coastal strip of the once great Duchy of Aquitaine remained in English hands.
The recovery of these lost lands became a major focus of English diplomacy. The war also galvanised opposition to Edward II among the English nobility and led to his eventual assassination (1327), which in turn caused the succession of the young Edward III. Charles IV died in 1328, leaving only a daughter, and an unborn infant which would prove to be a girl. The senior line of the Capetian dynasty thus ended, creating a crisis over the French succession. Edward III's mother was the daughter of Philip IV of France, giving him a claim to the French Crown after Charles IV's death.