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
HMS Agincourt (D86) the Fleet Review to celebrate the Coronation of Queen Elizabeth II. In the following year "Agincourt", along with the rest of the squadron, formerly flotilla, deployed to the Mediterranean. The squadron and "Agincourt" did not return home until the following year. In 1956 "Agincourt" she formed part of the Royal Navy force which took part in the Suez Crisis. In 1957, "Agincourt", and the 4th Destroyer Squadron, returned to the Mediterranean. In 1959, "Agincourt" and three of her sister-ships underwent conversion to become radar pickets. The conversion included the addition of the Sea Cat missile and new radar, as well