The alarm spread quickly from point to point, and before the invaders had come well within sight of the city the gates were securely closed and barricaded, and the valiant burghers were fully prepared to make a stout resistance.

As the ships came abreast of the Tower they were assailed by volleys of well aimed arrows, fired from the battlements. Heedless of Olaf's plans, King Sweyn drew his division yet nearer under the walls, with the intention of making an assault upon the citadel. But the attempt was useless. The defenders were hidden behind the ramparts and beyond reach of all missiles, while Sweyn's forces were fully exposed to the ceaseless hail of arrows and stones which seemed to issue out of the very walls. So many of his men fell that Sweyn was forced to retire.

The garrison could frustrate an assault upon the fortress, but they could not prevent so vast a number of ships from passing higher up the river and making an attack upon the old Roman rampart. While King Sweyn crossed to the opposite side of the stream and led an attack upon Southwark, Olaf effected a landing near Billing's Gate and directed all his strength upon the wall. He lost many men in the attempt, but at last a breach was made, and at the head of many hundreds of desperate warriors he entered the city. He had depended upon Sweyn following him; and had the Danish king been content to obey, London might indeed have been taken by sheer strength. As it was, however, Olaf quickly found that he had made a fatal mistake. Vast crowds of armed citizens met him at the end of each narrow street and dealt the invaders such lusty blows, with their bills and swords and volleys of heavy stones, that those who were not maimed or killed outright were forced back by overpowering strength, their ranks being driven into hopeless confusion. At one moment Olaf Triggvison found himself, with some six or seven of his men, surrounded by several scores of the defenders. He fought his way through them back to the city wall, where, through the breach that had been made, his hosts were escaping on board the ships. The besiegers were utterly defeated. Once again had the men of London rescued their city from its foes.

Sweyn Forkbeard had fared no better than Olaf had done. He had made a bold attempt to burn the town, but, like Olaf, he had been driven back to his ships with great slaughter.

On that same day the two defeated chiefs sailed away in wrath and sorrow, and with the loss of seven ships and two thousand men.

Now, under Alfred or Athelstane such a reverse as the invaders had met with before London would surely have been followed up by some crushing victory. But under the wretched Ethelred there was no attempt made to prevent the more fearful desolation of other parts of the kingdom. Olaf and Sweyn were calmly allowed to avenge their defeat by ravaging the coast at pleasure, and to pillage, burn and murder without meeting the slightest resistance. At the mouth of the Thames the two chiefs had divided their forces, Sweyn sailing northward towards the Humber, while Olaf took his course southward, and ravaged far and wide in the old kingdoms of Kent and Sussex.

Late in the summer, Olaf crossed into Hampshire, and now at last King Ethelred was roused, for the invaders threatened not only the royal city of Andover but also the royal person. The king had no army of sufficient strength to encounter his Norse enemy, and his navy was of still less consequence. The only course he seems to have thought of, therefore, was the old cowardly policy of again buying peace with gold. Olaf was allowed to anchor his fleet for the winter at Southampton, and in order to avert any raiding into the surrounding country, Ethelred levied a special tax upon the people of Wessex to supply the crews with food and pay. He also levied a general tax upon all England to raise the sum of sixteen thousand pounds as a bribe to the invaders to quit the kingdom.

This large sum of money was conveyed to Olaf Triggvison by the king's ambassadors, among whom was a certain Bishop Elfheah--a zealous Christian, who, in addition to gaining Olaf's solemn promise that he would keep the peace, took upon himself the task of converting the young chief to the Christian faith. Olaf had already been baptized by the good hermit of the Scillys; but he had not yet received the rite of confirmation. He now declared that he was willing to become entirely a Christian, and to set aside his belief in the old gods of Scandinavia. The bishop then led Olaf to the court at Andover, where Ethelred received him with every honour and enriched him with royal gifts. At the confirmation of Olaf, which took place with great pomp, King Ethelred himself was present, and even stood sponsor.

Olaf lived for many weeks at Andover, as King Ethelred's friendly guest, and before he left to join his ships he signed a treaty in which he engaged never again to invade England. This promise he faithfully kept, and for a time there was peace in the land. Ethelred believed that he had now rid his kingdom of all danger from the vikings. But he did not reckon with King Sweyn Forkbeard. Tempted by the great sums of money that had been extorted from the English, Sweyn returned again and again, and at last succeeded in expelling Ethelred from the land. For many years Sweyn was the virtual ruler of England, and he thus prepared the way for his son, Canute the Mighty, who was afterwards the chosen king of the English people.

Now, while Olaf Triggvison was still the guest of King Ethelred, there also lived at the court a certain princess named Gyda. She was the sister of the King of Dublin, in Ireland, and she was considered very beautiful. A great many wooers sought to wed with her, and among others a man named Alfwin, a renowned champion and man slayer. A day was fixed on which Gyda had promised to choose a husband, and many high born men had come together, hoping to be chosen. All were splendidly attired.