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 Siritsa River Battle of the Siritsa River The Battle of the Siritsa River (also Seritsa) took place on 27 August 1501 between the forces of the Livonian Order under Grand Master Wolter von Plettenberg on the one side and the forces of the Grand Duchy of Moscow and Pskov Republic on the other. The Russian forces were soundly defeated. Grand Prince Ivan III of Russia pursued expansionist policies, which strained Moscow's relations with Livonia. In 1492, Moscow built Ivangorod Fortress opposite of Narva and two years later closed down the Hanseatic office in Novgorod. Hanseatic merchants, most of them Livonians, were imprisoned.