The king had at first proposed to land in Guienne and relieve the forces in the south; but suddenly changing his design he disembarked at La Hogue and advanced through Normandy.

By this skilful movement Edward not only relieved Derby but threatened Paris, and left himself able to co-operate with either his own army in the south or the Flemings in the north.

Normandy was totally without defence, and after the sack of Caen, which was then one of the wealthiest towns in France, Edward marched upon the Seine.

His march threatened Rouen and Paris, and its strategical value was seen by the sudden panic of the French king.

Philip was wholly taken by surprise.