Edward III. hoped to be able to follow up this naval victory by striking a decisive blow on land. The deputies of the Flemish towns and his other allies met him at Ghent, and the Flemings agreed to aid him, if he would help them to get back Artois, which had formerly belonged to Flanders, but had been treacherously taken from them by Philip IV., King of France. In five days the towns had levied 140,000 foot soldiers, who all agreed to fight without pay in this war. Thus reinforced, Edward marched to Tournai, which he completely invested. Philip advanced from Arras to relieve the town. Discontent had already broken out in the confederate army. The Flemings were not professional soldiers, but were the burgers and handicraftsmen of the towns who had turned out to defend their own hearths and homes, marching under the banners of their different gilds. They were soon eager to get back to their shops and their looms. Philip's sister, Jeanne of Valois, a nun at Fontenelle hard by, appeared between the two armies as peacemaker, and a truce was agreed upon. Jacques van Arteveldt succeeded in obtaining most advantageous terms for the Flemings. With the habitual selfishness of a commercial and industrial people, having brought matters to a satisfactory conclusion for themselves, they thought no more of Edward's interests. He, too, had to agree to a truce for nine months, and to retire a second time without striking a decisive blow. He had expended vast sums of money in these two campaigns, and had gained nothing. He had only learnt one lesson, and that a very important one--that it was no use depending upon allies, and that henceforth he must trust to himself alone. The truce between France and England had been concluded at first for only nine months, till 25th September, 1341, but it was afterwards prolonged till 1342. Edward soon found a new opening for attacking France, in the contest that was going on about the succession of the Duchy of Britany. Edward III. determined to give his aid to De Montfort, whilst the other claimant, Charles of Blois, was supported by his uncle Philip. Here also, after awhile, a truce was agreed upon, which was to last till Michaelmas, 1346. A truce had also been made with Scotland, and David Bruce had returned to his kingdom.