Somme (river) invasion fleet of William the Conqueror assembled in the Bay of the Somme, at Saint-Valery-sur-Somme. The river also featured in the 1346 withdrawal of Edward III of England's army, which forded the river at the Battle of Blanchetaque during the campaign, which culminated in the Battle of Crécy. Crossing the river also featured prominently in the campaign which led to the Battle of Agincourt in 1415. In 1636, a Spanish army led by Thomas Francis, prince of Carignan, crossed the Somme defeating a French army during the Thirty Years War threatening Paris. Most famously, the Battle of the Somme, during
Battle of Poitiers 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. Poitiers was the second major English victory of the Hundred Years' War. Poitiers was fought ten years after the Battle of Crécy (the first major victory), and about half a century before the third, the Battle of Agincourt (1415). The