When the King returned to Trondhjem he had the two finest ships of the north, the "Crane" and the "Serpent," the latter the largest, the former the swiftest vessel that had yet been launched on the northern seas. Proud of such weapons, he wondered if he could not build a warship longer than the "Serpent" and swifter than the "Crane," and he consulted his best shipbuilder, Thorberg Haarklover, i.e. the "Hair-splitter," so named from his deftness with the sharp adze, the shipwright's characteristic tool in the days of wooden walls. Thorberg was given a free hand, and promised to build a ship that would be famous for centuries. This was the "Lang Ormen," or "Long Serpent," a "Dreadnought" of those old Viking days. She was 150 feet long, and her sides rose high out of the water, but she had also a deep draught. The bow, strengthened with a cut-water of steel, was fashioned like the head of a huge dragon, the stern carved into a dragon's tail, and bow and stern were covered with scales of gold. She had sixty oars, and her crew was made up of no less than six hundred picked men, among them warriors whose names live in history. For a while Olaf, with his great ships, reigned victoriously over Norway, defeating more than one effort of the old pagan Vikings to shake his power. One of these defeated rivals, Erik Jarl (Earl Erik), took refuge in Sweden, gathered there a number of adherents who had like himself fled from Norway to avoid Olaf's strong-handed methods of reform and conversion, and with them sailed the Baltic, plundering its coasts in the old Viking fashion. King Svend of Denmark was jealous of the power of Norway, welcomed Erik at his Court, and gave him his daughter's hand. Svend's queen, Sigrid, was a Swedish princess, and Erik set to work to form a triple league against Norway of which the three branches would be his own following of Norwegian malcontents and the Swedes and Danes. Olaf had spent the summer of the year 1000, with a fleet of sixty ships, in the South-Eastern Baltic. Autumn was coming, and the King was preparing to return home before the wintry weather began, when news arrived that hastened his departure. It was brought by one of his jarls, Earl Sigvald, who came with eleven ships, manned by his clansmen, and reported that the rebel Erik had been joined by the kings of Sweden and Denmark, and the three fleets of the allies were preparing to fall upon Olaf on his homeward voyage. But Sigvald assured the King that if he would allow him to pilot the Norwegian fleet he would take it safely through channels deep enough for even the "Long Serpent," and elude the hostile armada, which outnumbered Olaf's fleet three to one. Sigvald, however, was a traitor. He had promised to lead Olaf into waters where the allied fleets would be waiting to attack him. And he knew they would be anchored inside the island of Rügen, near the islet of Svold.