4. =Dispute with France. 1336--1337.=--Philip VI., like Philip IV. in the days of Edward I. (see p. 218), had his own reasons for not allowing the Scots to be crushed. He pursued the settled policy of his predecessors in attempting to bring the great fiefs into his power, and especially that part of Aquitaine which was still held by the most powerful of his vassals, the king of England. Whilst Edward was doing his best to bring Scotland into subjection by open war, Philip was doing his best to disturb Edward in his hold upon Aquitaine by secret intrigues and legal chicanery. Ill-feeling increased on both sides. Philip welcomed David Bruce and gave him protection in France, and in =1336= French sailors attacked English shipping and landed plunderers in the Isle of Wight. In =1337= Edward determined to resist, and the long war roughly known as the Hundred Years' War began. It was in reality waged to discover by an appeal to arms whether the whole of Aquitaine was to be incorporated with France and whether Scotland was to be incorporated with England. That which gave it its peculiar bitterness was, however, not so much the claims of the kings, as the passions of their subjects. The national antagonism aroused by the plunderings of French sea-rovers would be invigorated by the plunderings of Englishmen in the fields of France. 5. =Edward's Allies. 1337--1338.=--To Edward it was merely a question of defending, first England, and then Aquitaine, against aggression. He won over, with large offers of money, the alliance of the princes of the Empire whose lands lay round the French frontier to the north and east, and even gained the support of the Emperor Lewis the Bavarian. His relations with Flanders were even more important. In Flanders there had sprung up great manufacturing towns, such as Ghent, Bruges, and Ypres, which worked up into cloth the wool which was the produce of English sheep. These wealthy towns claimed political independence, and thus came into collision with their feudal lord, the Count of Flanders. Early in the reign of Philip VI., the Count, who held the greater part of his lands from the king of France, had appealed to Philip for support, and Philip, who, unlike his wiser predecessors, despised the strength which he might gain from the goodwill of citizens in a struggle against their lords, took the part of the Count, and for a time crushed the citizens at the battle of Cassel. After a while the cities recovered themselves, and formed an alliance under the leadership of Jacob van Arteveldt, a Flemish nobleman, who had ingratiated himself with them by enrolling himself amongst the brewers of Ghent, and who was now successful in urging his countrymen to enter into friendship with Edward.