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 the Herrings numbering between 3,000 and 4,000, confronted the much smaller English force who had set up defensive positions by drawing up the supply wagons into a makeshift fortification. The entire defensive formation was then further protected by the placement of sharpened spikes all around to prevent the French cavalry from charging, a tactic which had been employed, with great success, at the Battle of Agincourt. The French attack began with a bombardment using gunpowder artillery, a relatively new weapon for the time and one whose proper usage was not well understood although it was damaging to the wagons and caused English