Ere the diet had come together, Norby had made a second irruption into Fredrik's territory in the south of Sweden. Toward the end of March he had sailed from Gotland with twelve men-of-war, had captured a couple of the strongest fortresses in Bleking, and had enlisted many inhabitants of that province in the cause of Christiern. Fredrik was by this time fully alive to the error he had made in relying for a moment on the promises of Norby. His anxiety was increased still further when the news was brought him that Christiern's brother-in-law, the emperor, had defeated the king of France, and was coming with all his forces to the relief of Christiern. One drop of comfort was granted him when he heard that a fleet from Lubeck had sailed to Gotland in Norby's absence, and on May 13 had seized the town of Visby. In spite of this disaster, Norby's hopes ran high. He sent letters every day to Christiern, telling him that Denmark as well as Sweden was overrun with rebels, and that he now had a chance of restoration such as he had never had before. But Norby's hopes were at the very highest when the bubble burst. The emperor proved too busy with his own affairs to send his army to the North, and Christiern could not raise the armament requisite for a foreign war. Gustavus, moreover, sent his troops to drive back the invader, and the Danish nobility enlisted in behalf of Fredrik. The result was that ere the close of May the pirate was routed in two important battles. Gustavus literally hugged himself for joy, and sent off a letter of congratulation to the army that had won the day. "My good men," he began, "you may rest assured that if Norby shall escape you and come this way, he will meet with a reception that will cause him little joy. From his assertion that he expected aid from us, you will perceive he sought to foster discord between your realm and us.... We had already ordered our men in Vestergötland to go to your relief as soon as you should need them, which now, thank God, we trust will never be." The monarch's congratulation was a little premature. Norby's force was scattered, but it was not lost. Retiring with his stragglers to one of the Danish strongholds, he ensconced himself within, and there remained,--a constant menace to the neighborhood. Late in June the pirate, reduced to the utmost extremity, opened negotiations with Fredrik. That monarch, still in dread of Christiern, readily complied. Norby proceeded to Copenhagen, where it was finally arranged that he should yield the castle of Visby, which the Lubeck army had been besieging ever since the town of Visby fell; and that in return the pirate should be granted the whole province of Bleking with all its strongholds, to hold as a fief of Denmark. Norby was then conveyed to Denmark, and before the first of August these terms were carried out. Visby passed into the hands of Lubeck, and the pirate returned to Bleking to guard his fief.[118]