When the army was ready they rowed briskly against the enemy, and both sides raised a war-shout. Inge's men did not bind their ships together, but let them be loose; for they rowed right across the current, by which the large ships were much swayed. Erling Skakke laid his ship beside King Hakon's ship, and ran the stem between his and Sigurd's ship, by which the battle began. But Gregorius's ship swung upon the ground, and heeled very much over, so that at first she could not come into the battle; and when Hakon's men saw this they laid themselves against her, and attacked Gregorius's ship on all sides.
Ivar, Hakon Mage's son, laid his ship so that the stems struck together; and he got a boat-hook fastened on Gregorius, on that part of his body where the waist is smallest, and dragged him to him, by which Gregorius stumbled against the ship's rails; but the hook slipped to one side, or Gregorius would have been dragged over-board. Gregorius, however, was but little wounded, for he had on a plate coat of armour. Ivar called out to him, that he had a "thick bark." Gregorius replied, that if Ivar went on so he would "require it all, and not have too much."
It was very near then that Gregorius and his men had sprung overboard; but Aslak Unge threw an anchor into their ship, and dragged them off the ground. Then Gregorius laid himself against Ivar's ship, and they fought a long while; but Gregorius's ship being both higher sided and more strongly manned, many people fell in Ivar's ship, and some jumped overboard. Ivar was so severely wounded that he could not take part in the fight. When his ship was cleared of the men, Gregorius let Ivar be carried to the shore, so that he might escape; and from that time they were constant friends.