Edward III., though he had proclaimed himself King of France, did not at the outset of his claim adopt the policy of a man firmly resolved and burning to succeed. From 1337 to 1340 he behaved as if he were at strife with the Count of Flanders rather than with the King of France. He was incessantly to and fro, either by embassy or in person, between England, Flanders, Hainault, Brabant, and even Germany, for the purpose of bringing the princes and people to actively co-operate with him against his rival; and during this diplomatic movement such was the hostility between the King of England and the Count of Flanders that Edward’s ambassadors thought it impossible for them to pass through Flanders in safety, and went to Holland for a ship in which to return to England. Nor were their fears groundless; for the Count of Flanders had caused to be arrested, and was still detaining in prison at the castle of Rupelmonde, the Fleming Sohier of Courtrai, who had received into his house at Ghent one of the English envoys, and had shown himself favorable to their cause. Edward keenly resented these outrages, demanded, but did not obtain, the release of Sohier of Courtrai, and by way of revenge gave orders in November, 1337, to two of his bravest captains, the Earl of Derby and Walter de Manny, to go and attack the fort of Cadsand, situated between the Island of Walcheren and the town of Ecluse (or Sluys), a post of consequence to the Count of Flanders, who had confided the keeping of it to his bastard brother Guy, with five thousand of his most faithful subjects. It was a sanguinary affair. The besieged were surprised, but defended themselves bravely; the landing cost the English dear; the Earl of Derby was wounded and hurled to the ground, but his comrade, Walter de Manny, raised him up with a shout to his men of “Lancaster, for the Earl of Derby; “and at last the English prevailed. The Bastard of Flanders was made prisoner; the town was pillaged and burned; and the English returned to England, and “told their adventure,” says Froissart, “to the king, who was right joyous when he saw them and learned how they had sped.”