As Olaf got the message in the evening, they travelled in the night six miles, which people considered an extraordinarily long march. They arrived at Rydiokul while the priest was still singing mass, and it was pitch-dark. Olaf and his men went into the room, raised a war-shout, and killed some of the earl's men who had not gone to the early mass. Now when Erling and his men heard the war-shout, they ran to their weapons, and hastened down to their ships.
Olaf and his men met them at a fence, at which there was a sharp conflict. Erling and his men retreated along the fence, which protected them. Erling had far fewer men, and many of them had fallen, and still more were wounded. What helped Earl Erling and his men the most was, that Olaf's men could not distinguish them, it was so dark; and the earl's men were always drawing down to their ships. Are Thorgeirson, father of Bishop Gudmund fell there, and many other of Erling's court- men. Erling himself was wounded in the left side; but some say he did it himself in drawing his sword.
Orm the King-brother was also severely wounded; and with great difficulty they escaped to their ships, and instantly pushed off from land. It was generally considered as a most unlucky meeting for Olaf's people, as Earl Erling was in a manner sold into their hands, if they had proceeded with common prudence.
He was afterwards called Olaf the Unlucky; but others called his people Hat-lads. They went with their bands through the Uplands as before. Erling again went down to Viken to his ships, and remained there all summer. Olaf was in the Uplands, and sometimes east in the forest districts, where he and his troop remained all the next winter (A.D. 1168).