Now, Sweyn Forkbeard was a very cautious man in the affairs of war, and he well knew that he was himself no match for so powerful a warrior as Olaf the Glorious. But he remembered that he was not alone in his desire to humble the monarch of the Norselands. His own son in law, Olaf the Swede King, had sworn by Thor's hammer to avenge the insult to his mother Queen Sigrid the Haughty, and the help of the Swede King in this war would be of great account. In addition to the King of Sweden there was Earl Erik of Lade, who was eager to take vengeance upon Olaf Triggvison for the slaying of his father Earl Hakon. Since the coming of King Olaf into Norway, Earl Erik had become famous as a viking; he had engaged in many battles both on land and on the sea. It has already been told how he fought in the sea fight against the vikings of Jomsburg. He was now one of the strongest war men in all Scandinavia, and his fleet of battleships was equal to that of either Sweyn of Denmark or Olaf of Sweden.

So when Forkbeard heard that Olaf Triggvison had entered the Baltic he sent men east into Sweden, bidding them give word to the Swede King and to Earl Erik that now was their time if they would join in battle against their common foe.

Sweyn Forkbeard was at this time very friendly with Earl Sigvaldi, the chief of the Jomsvikings, and he enlisted his help. It happened that Sigvaldi's wife, the Princess Astrid, was then staying at the court of her father King Burislaf, in Wendland. It was, therefore, a very natural thing that the earl should go thither also. Sweyn urged him to make the journey, to spy upon King Olaf's fleet, and to lay such a trap that Sweyn and his allies should not fail in their object. Earl Sigvaldi undertook this mission, and fared eastward to Wendland with eleven longships. Meeting King Olaf he made pretence to renew his old friendship with the man whom he had formerly known as Ole the Esthonian. He flattered him, praised his great wisdom, and, more than all, spoke highly of his fleet and the surpassing splendour of the Long Serpent. Their discourse was most friendly at all times, nor did Olaf for a moment suspect the treachery that underlay the earl's soft speeches and his seeming goodwill. Deep into the king's open heart Sigvaldi wormed his way, until they were as brothers one with the other. When Olaf hinted that he would be going back to Norway, that the weather was fair for sailing, and that his men were homesick and weary of lying at anchor, Sigvaldi made some plausible excuse and still held him back; and the time went on, the summer days grew shorter, and yet Olaf made no move.

But on a certain day there came a small fishing boat into the bay, and dropped anchor near to the earl's longship. In the darkness of the next night one of her men had speech with Sigvaldi, and gave him the tidings for which he had so long waited. These tidings were that the host of the Swede King had now come from the east, that Earl Erik also had arrayed his forces, and that these lords had joined with Sweyn Forkbeard, and all were sailing downward to the coast of Wendland. They had appointed to waylay King Olaf Triggvison in a certain channel running between the mainland and the island of Svold, and Sweyn had now sent this messenger bidding the earl to so bring it about that they might fall upon King Olaf in that place. On the next morning Sigvaldi put out one of his boats, rowed alongside of the Long Serpent, and stepped upon her deck. He found King Olaf sitting at his ease against the rail, carving runes upon the lid of a wooden box that he had made for the holding of the queen's jewels. Sigvaldi did not disturb him, but took a few turns across the deck and looked up into the sunlit sky. The king blew away the chips of wood that he had been cutting from the box lid and looked up.

"A fairer and finer day for sailing I have never yet seen," said he. "Why should we not heave anchor this very morning? The wind bodes well for a free run westward, and in truth, Sigvaldi, I am getting wearied of this idleness and the sight of these sandy shores."

"Let it be so by all means if you so wish it," answered the earl in a light tone of unconcern. "I, too, should be not ill pleased to be once more upon the open sea, although I shall be sorry to make an end to our close intercourse, for the sooner we sail the sooner must we part."

"The parting need not be for long," said the king. "I am hoping that you will soon see your way to coming north to Thrandheim, there to spend many happy summer months with us. And we may take a cruise in the Long Serpent across to the Orkneys, or north even to Iceland."

A mocking smile played about the earl's lips.

"You are ever ready with your bright plans for the future, King Olaf," he said, as he raised his great hand to stroke his bushy black beard. "But the next summer is a long while off, and it may be--who can say?--it may be that we shall not then be both alive."

King Olaf gave a playful laugh.