Olaf the White King of Dublin and Ivar the Boneless led a Norse fleet that besieged Dumbarton Rock for four months before the fortress fell. The sack of Dumbarton Alt Clut was the greatest military catastrophe in the history of the Strathclyde Britons. The Norse carried away an enormous train of captives and treasure including enslaved Britons, Scots and Picts. This was the largest Norse military operation on the British mainland.
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