 The saga states that , with the coming of spring , Hákon ordered the preparation of Óspakr 's fleet . While preparations were under way Óláfr came to the king at Bergen , and reported the unrest in the Isles , noting that Alan had assembled a powerful army and was causing unrest in the region . When the fleet left Norway for Orkney , Óláfr accompanied it on @-@ board Páll Bálkason 's ship . When the fleet reached Orkney , several ship @-@ commanders sailed to Skye , where they defeated a certain <unk> <unk> in a sea @-@ battle . The fleet then united at Islay , and was strengthened by Óspakr 's brothers and their followers , and swelled in size to 80 ships . The fleet then sailed south and around the Mull of Kintyre to Bute , where the force invaded the island and took the castle whilst suffering heavy casualties . The fleet then sailed to Kintyre , and Óspakr fell ill and died . The Chronicle of Mann , however , specifically states that Óspakr was struck by a stone and killed , and later buried on Iona . 
