Erling Skakke's army wished to go on to the bridge; but Erling told them to go up along the river, which was small, and not difficult to cross, as its banks were flat; and they did so. Earl Sigurd's array proceeded up along the ridge right opposite to them; but as the ridge ended, and the ground was good and level over the river, Erling told his men to sing a Paternoster, and beg God to give them the victory who best deserved it.
Then they all sang aloud "Kyrie Eleison", and struck with their weapons on their shields. But with this singing 300 men of Erling's people slipped away and fled. Then Erling and his people went across the river, and the earl's men raised the war-shout; but there was no assault from the ridge down upon Erling's array, but the battle began upon the hill itself. They first used spears then edge weapons; and the earl's banner soon retired so far back, that Erling and his men scaled the ridge. The battle lasted but a short time before the earl's men fled to the forest, which they had close behind them.
This was told Earl Sigurd, and his men bade him fly; but he replied,
"Let us on while we can."
And his men went bravely on, and cut down on all sides. In this tumult fell Earl Sigurd and Jon Sveinson, and nearly sixty men. Erling lost few men, and pursued the fugitives to the forest. There Erling halted his troops, and turned back.
He came just as the king's slaves were about stripping the clothes off Earl Sigurd, who was not quite lifeless. He had put his sword in the sheath, and it lay by his side. Erling took it, struck the slaves with it, and drove them away. Then Erling, with his troops, returned, and sat down in Tunsberg. Seven days after Earl Sigurd's fall Erling's men took Eindride Unge prisoner, and killed him, with all his ship's crew.