With the other young king, Earl Sweyn, Olaf did not find his task so easy, since Sweyn fought for his rights in a naval battle in which he had forty-five ships and three thousand men, while Olaf had less than half that number of men and ships. Olaf won the battle by a shrewd stratagem. He told his men to act at first only on the defensive, holding back their weapons until the enemy had thrown away theirs. On came Earl Sweyn's fleet, fiercely attacking that of Olaf, a cloud of spears and arrows filling the air. As none came back from Olaf's men, their opponents fancied they were afraid, and rushed on them eagerly. But by this time their spears and arrows had grown scarce, and when a storm of these came from the opposite side they were taken by surprise and many of them killed. Wild with fear, they now sought to escape, and in the end their whole fleet broke and fled, leaving victory to the new king. Sweyn fled to Sweden, whose king promised him help to regain his kingdom. But he died before his plans were ripe and Olaf was left without a rival except the king of Sweden, who had won a part of Norway in a former battle and now held it. This source of trouble was settled by the Swedes themselves, who had no fancy for fighting to help their king's ambition, and forced him to agree to yield his claim and give his daughter Ingegerd to Olaf for wife. So by a marriage Olaf won the remainder of his kingdom and became ruler over all Norway; but not by marrying Ingegerd, for he chose instead her sister Aastrid. There is a pretty story told just here in the sagas, or historical tales of the Icelanders. Thus it reads: Sigurd Syr, who had married Olaf's mother Aasta, died in 1018, and Olaf came to her house to help in settling her affairs. She had three boys, Guttorm, Halfdan, and Harold, whom she brought into the hall to introduce to their half-brother, the king. Olaf put the two older ones on his knees and made so fierce a face at them that they ran away sadly scared. Then he took up little Harold and stared at him in the same way. The brave youngster was not so easily frightened as his brothers and stared back at the king. Then Olaf pulled his hair, but the daring youngster pulled his beard in exchange. "He will do," said Olaf, setting him down with a laugh. The next day the king and his mother watched the boys at their play. The older two amused themselves by building barns, in which they put toy cows and sheep; but Harold launched mock boats on a pond and watched them drift away. "What do you call them?" asked Olaf. "Ships of war," said the boy. "Good lad," answered the king; "the day will come when you will command real ships." Calling the boys to him, he asked Guttorm, the oldest, what he most wished for. "Land," said the boy. "How much?" "Enough to sow as much grain every summer as would cover the headland yonder." Ten large farms covered the headland in question. "And what do you most desire?" the king asked Halfdan.