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 Caecus River they did not possess access to the sea. Battle of the Caecus River The Battle of the Caecus River was a battle that occurred in 241 BC between the armies of the Kingdom of Pergamon, commanded by Attalus I and the Galatian tribes who resided in Anatolia. The battle took place near the river source of the Caecus River and resulted in a victory for the Kingdom of Pergamon. During the 3rd century BC, there was a large migration of Gauls towards the Orient. After passing through Greece, they arrived at Asia Minor where they survived by raiding the towns