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 Agincourt and various prominent French noblemen of the Armagnac party. This battle is notable for the use of the English longbow in very large numbers, with the English and Welsh archers making up nearly 80 percent of Henry's army. The devastation of the French cavalry at their hands signaled the decline of cavalry and the increasing dominance of ranged weapons on the battlefield. Agincourt is one of England's most celebrated victories and was one of the most important English triumphs in the Hundred Years' War, along with the Battle of Crécy (1346) and Battle of Poitiers (1356). It forms the centrepiece