The Chronicle of The Kings of Norway
Part 7 - Battle In Eyrarsund
Then Hakon steered southwards with his fleet to seek the vikings, and so on to Sealand. He rowed with two cutters into the Eyrarsund, where he found eleven viking ships, and instantly attacked them. It ended in his gaining the victory, and clearing the viking ships of all their men.
So says Guthorm Sindre: —
"Hakon the Brave, whose skill all know
To bend in battle storm the bow,
Rushed o'er the waves to Sealand's tongue,
His two war-ships with gilt shields hung,
And cleared the decks with his blue sword
That rules the fate of war, on board
Eleven ships of the Vindland men. —
Famous is Hakon's name since then."