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 La Brossinière An English relief army advanced on his position and forced him to abandon the siege. Battle of La Brossinière The Battle of La Brossinière or Battle of la Gravelle (French – "la "besoigne" de la Brossinière") was a battle of the Hundred Years' War on 26 September 1423. It occurred at La Brossinière (commune of Bourgon, Mayenne), between the forces of England and France, shortly after hostilities had resumed, following the battle of Agincourt (1415). The English force commanded by Sir John De la Pole, brother of William de la Pole, Earl of Suffolk, which had returned to Normandy after