Skaldic poetry suggests he led a successful seaborne attack that took down London Bridge, though Anglo-Saxon sources do not confirm this. This may have been in 1014, restoring London and the English throne to Æthelred the Unready and removing Cnut.[19]
https://en.wikipedia.org/wiki/Olaf_II_of_Norway#Reign
Can you imagine growing up with the name of Cnut, kids can be so mean!