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 the ground by the English. As the mêlée developed, the French second line also joined the attack, but they too were swallowed up, with the narrow terrain meaning the extra numbers could not be used effectively. Rogers suggested that the French at the back of their deep formation would have been attempting to literally add their weight to the advance, without realising that they were hindering the ability of those at the front to manoeuvre and fight by pushing them into the English formation of lancepoints. After the initial wave, the French would have had to fight over and on