Magnus had again need of his ally’s assistance against his rebellious subjects. The inhabitants of Wisby, capital of the isle of Gothland, refused to pay the impost which he had laid upon them; and Valdemar, in obedience to his wish, sailed to chastise them. Wisby was one of the greatest ports in Europe; it was the magazine where the merchandise of the Baltic was kept. Of this much belonged to the Hanse Towns, especially to Lubeck. Immense was the booty which the Danish monarch seized in that town; but why he should plunder the subjects of his ally for his own benefit, is not easy to be explained. Whatever were his own reasons, he soon repented of his violence. The Swedes, indignant with their monarch whom they knew to have been the occasion of the disaster, shut him up in a fortress, called Hako of Norway to aid them, and declared war against Denmark. To obtain more assistance, they entered into alliance with the enemies of Denmark,—with the counts of Holstein, with the duke of Mecklenburg, and with the Hanse Towns, which were justly exasperated at the plunder of Wisby. The confederated powers put their armaments in motion, and soon reduced Copenhagen. Helsingburg in Scania was besieged, but Valdemar raised the siege and defeated the allied fleet with great loss. Vordingburg was next assailed, but with no better success; and other disasters soon rendered the allies anxious for peace, which was concluded at Lubeck in 1363. But it was of short continuance. There was a general meeting of deputies from all the towns of the Hanseatic League, above seventy in number; and the result of their deliberations was a new war. It was indeed evident, that unless that body secured the free transit of merchandise, there must be an end to all mercantile enterprise, and the worst days of piracy must be restored. Two armaments were soon equipped; and the number of assailants was increased by the adhesion of Denmark’s hereditary enemies. Valdemar, terrified, had recourse to negociations. Adolf, count of Holstein, he detached from the league by investing him with the isle of Femeren. The Hanse Towns he propitiated by commercial privileges. A truce was accordingly made, and the king was left to resume his intrigues in the North. [Sidenote: 1362 to 1363.]