Then King Olaf proceeded westwards to Grislupollar, and fought there
with vikings at Williamsby; and there also King Olaf gained the victory.
So says Sigvat:--
"The eleventh battle now I tell,
Where it was fought, and what befell.
At Grislupol our young fir's name
O'ertopped the forest trees in fame:
Brave Olaf's name--nought else was heard
But Olaf's name, and arm, and sword.
Of three great earls, I have heard say,
His sword crushed helm and head that day."