There were two vikings called Vigbiod and Vestmar; they were
South-islanders, and lay out both winter and summer; they had thirteen
ships, and harried mostly in Ireland, and did many an ill deed there
till Eyvind the Eastman took the land-wardship; thereafter they got
them gone to the South-isles, and harried there and all about the
firths of Scotland: against these went Thrand and Onund, and heard
that they had sailed to that island, which is called Bute. Now Onund
and his folk came there with five ships; and when the vikings see
their ships and know how many they are, they deem they have enough
strength gathered there, and take their weapons and lay their ships in
the midst betwixt two cliffs, where was a great and deep sound; only
on one side could they be set on, and that with but five ships at
once. Now Onund was the wisest of men, and bade lay five ships up into
the sound, so that he and his might have back way when they would, for
there was plenty of sea-room astern. On one board of them too was a
certain island, and under the lee thereof he let one ship lie, and his
men brought many great stones forth on to the sheer cliffs above, yet
might not be seen withal from the ships.
Now the vikings laid their ships boldly enough for the attack, and
thought that the others quailed; and Vigbiod asked who they were that
were in such jeopardy. Thrand said that he was the brother of Eyvind
the Eastman, "and here beside me is Onund Treefoot my fellow."