They were Viking cruisers, on their way to plunder some coast town; and the old Emperor's prophecy was verified when the Norman, who was a civilized Norseman, became for a while the conquering race of Europe. Even before the death of Charlemagne the Norse and Danish sea-kings were raiding, plundering, and burning along the coasts of his Empire. Two hundred years of our own history is made up of the story of their incursions. England and Ireland bore the first brunt of their onset, when they found the ways of the sea. But they ravaged all the western coasts of Europe, and even showed themselves in the Mediterranean. From the end of the eighth till the beginning of the eleventh century they were the terror of the western world, and early in that dark and stormy period their raids had grown into great expeditions; they landed armies that marched far inland, and they carved out principalities for themselves.

Western Europe had a brief respite at times when the Vikings fought amongst themselves. In early days there were frequent struggles for supremacy in Norway, between local kinglets and ambitious chiefs. Fighting was in the blood of the Northmen. Two sea-roving squadrons would sometimes challenge each other to battle for the mere sake of a fight. As Norway coalesced into a single kingdom, and as the first teachers of Christianity induced the kings to suppress piracy, there was more of peace and order on the Northern Seas. But in this transition period there was more than one struggle between the Scandinavian kingdoms, Norway, Sweden, and Denmark. One of the most famous battles of these northern wars of the sea-kings was fought in this period, when the old wild days of sea-roving were drawing to an end, and its picturesque story may well be told as that of a typical Norse battle, for its hero, King Olaf Tryggveson, was the ideal of a northern sea-king.

Olaf was a descendant of the race of Harold Haarfager, "Fair-haired Harold," the warrior who had united the kingdom of Norway, and made himself its chief king at the close of the ninth century. But Olaf came of a branch of the royal house that civil war had reduced to desperate straits. He was born when his mother, Astrid, was a fugitive in a lonely island of the Baltic. As a boy he was sold into slavery in Russia. There, one day, in the marketplace of an Esthonian town, he was recognized by a relative, Sigurd, the brother of Astrid, and was freed from bondage and trained to arms as a page at the Court of the Norse adventurers who ruled the land. The "Saga" tells how Olaf, the son of Tryggva, grew to be tall of stature, and strong of limb, and skilled in every art of land and sea, of peace and war. None swifter than he on the snow-shoes in winter, no bolder swimmer when the summer had cleared the ice from the waters. He could throw darts with both hands, he could toss up two swords, catching them like a juggler, and keeping one always in the air. He could climb rocks and peaks like a mountain goat. He could row and sail, and had been known to display his daring skill as an athlete by running along the moving oars outside the ship. He could ride a horse, and fight, mounted or on foot, with axe or sword, with spear or bow.

In early manhood he came back to Norway to avenge the death of his father Tryggva, and then took to sea-roving, for piracy was still the Norseman's trade. He raided the shores of the Continent from Friesland to Northern France, but most of his piratical voyages were to the shores of our own islands, and many a seaboard town in England, Wales, Scotland, and Ireland saw Olaf's plundering squadron of swift ships. Five was the number of them with which he visited the Orkneys.

The Viking warships were small vessels. The ship dug out of the great grave mound at Sandefjord, in Norway, and now shown at Christiania, is seventy-seven feet long, with a beam of seventeen amidships, and a depth of just under six feet. Her draught of water would be only four feet, and she would lie very low in the water, but her lines are those of a good sea boat. She had one mast, forty feet high, to carry a crossyard and a square sail, and she had thirty-two oars, sixteen on each side. It says something for the seamanship of the Northmen that it was with ships like this they sailed the Atlantic waves off the west coast of Ireland, and made their way by the North Sea and the verge of the Arctic to the Faroes, Iceland, Greenland, and the mysterious "Vineland."[4]

Raiding in the Irish Sea, Olaf Tryggveson made a stay in a harbour of the Scilly Islands, and there he became a convert to Christianity. On the same voyage he married the Countess Gyde, sister of his namesake, Olaf Kvaran, the Danish King of Dublin. It was while he was staying in Ireland with the Dublin Danes that he heard news from Norway that opened larger ambitions to him. The land was divided among many chiefs, and the most powerful of them was hated as an oppressor by the people, who, he was told, would gladly welcome as their king a leader as famed as Olaf Tryggveson, and representing the line of Harold the Fair-haired. Helped by the Danes of Ireland, he sailed back to Norway, to win its crown for himself, and to cast down the worship of Thor and Odin, and make the land part of Christendom.

In the first enterprise he was quickly successful, and in 995 he was recognized as King of Norway at Trondhjem. During the five years that he reigned he devoted much of his energy to the second part of his mission, and made among his countrymen many real converts, and found still more ready to accept external conformity. Sometimes he would argue, exhort, appeal to the reason and the goodwill of chiefs and people. But often the old Viking spirit of his pagan days would master him, and he would hack down with his battle-axe the emblems and the altars of Thor and Odin, and challenge the old gods to avenge the insult if they had the power, and then tell the startled onlookers that if they were to be loyal to him and live in peace they must accept the new and better creed.

The open sea and the deep fiords running far into the hills were the best highways of his kingdom, and Olaf spared no effort to maintain a good fighting fleet, the best ships of which lay anchored before his great hall at Trondhjem when he was at home. When he went out to war his path was by the sea. He hunted down the pirates and destroyed their strongholds in the northern fiords, with none the less zeal because these places were also the last refuge of the old paganism and its Berserker magicians.

He had built for his own use a ship called the "Crane" (Tranen), longer than ships were usually made at the time, and also of narrower beam. Her additional length enabled more oars to be used, and her sharp bow, carved into a bird's head, and her graceful lines made her the fastest ship in the fiords when a good crew of rowers was swinging to the oars. A good rowing-boat is generally a bad sailer, but Olaf had made the "Crane" swift enough under canvas, or to speak more accurately, when her sails of brightly dyed wool were spread. She was given high bulwarks, and must have had more than the usual four-foot draught of water, for she carried plenty of heavy stone ballast to stiffen her under sail. With the "Crane" as his flagship, Olaf sailed northward to attack the Viking Raud, pirate and magician, who held out for the old gods and the old wild ways. Raud had another exceptionally large ship, the longest in Norway, and till the "Crane" was built the swiftest also. The bow, carved into a dragon's head and covered with brazen scales, gave Raud's ship the name of the "Serpent" (Ormen). As Olaf sailed northward Raud and his allies met him in a skirmish at sea, but soon gave way to superior numbers, and Raud, when he steered the "Serpent" into the recesses of Salten Fiord, thought he had shaken off pursuit, especially as the weather had broken, and wild winds, stormy seas, and driving mists and rain squalls might well make the fiord inaccessible to Olaf's fleet. Raud sat late feasting and drinking, and in the early morning he still lay in a drunken sleep when the "Crane" slipped into the fiord despite mist and storm, and Olaf seized the dragon ship and made Raud a prisoner almost without striking a blow.

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.