'In the cities of Flanders,' says Dr. Gardiner, 'had arisen manufacturing populations which supplied the countries round with the products of the loom. To the Ghent and Bruges of the Middle Ages England stood in the same relation as that which the Australian colonies hold to the Leeds and Bradford of our own day. The sheep which grazed over the wide, unenclosed pasture-lands of our island formed a great part of the wealth of England, and that wealth depended entirely on the flourishing trade with the Flemish towns in which English wool was converted into cloth.' When, therefore, Edward III. claimed the throne of France, and the Hundred Years' War began, it was of vital importance to the trade of Flanders and England that the merchants of the two countries should maintain friendly relations with each other. But Philip of Valois had persuaded the Count of Flanders, Louis de Nevers, to order the arrest of all the English in Flanders, and Edward had retaliated by arresting all the Flemings who were in England, and forbidding the export of English wool to Flanders. The result was that the weavers of Bruges and the other manufacturing towns of Flanders found themselves on the road to ruin; and, having no interest in the question at issue between the Kings of France and England, apart from its effect on their commercial prosperity, the burghers of Bruges, Ghent, and Ypres, under the leadership of the famous Jacob van Artevelde (anticipating, as one of the modern historians of Bruges has noticed, what the Great Powers did for Belgium in 1830[6]), succeeded in securing, with the assent of Philip, the neutrality of Flanders. The French King, however, did not keep faith with the Flemings, but proceeded to acts of aggression against them, and a league against France was formed between England and Flanders. In June, 1340, Edward, who was then in England, hearing that an immense number of French ships of war were at anchor in the Zwijn, set sail to give them battle with a squadron of 300 vessels. The English fleet anchored off the coast between Blankenberghe and Heyst on the evening of June 23, and from the top of the dunes the English scouts saw in the distance the masts of the French ships in the Zwijn.