In what was likely early January 1229, the chronicle records that Rǫgnvaldr caught the forces of Óláfr unaware, as Rǫgnvaldr sailed from Galloway with five ships, and launched a nocturnal raid upon the harbour at St Patrick's Isle, near what is today the town of Peel. During this assault, the chronicle records that Rǫgnvaldr had all of the ships of Óláfr and his chieftains destroyed. Although the chronicle's description of the attack alludes to Gallovidian involvement, as it states that the expedition originated from Galloway, the fact that Rǫgnvaldr commanded only five ships suggests that this support may have been waning. This does not necessary indicate that Alan abandoned Rǫgnvaldr's cause, however, as Alan may well have been engaged in campaigning against the ongoing Meic Uilleim insurrection against the Scottish Crown. Even if this was the case, Rǫgnvaldr may have also considered Alan's involvement a detriment at this stage.