A record dated 3 January 1214 appears to confirm the English Crown's intentions of protecting the Islesmen, as it prohibits certain "mariners of Ireland" from entering Rǫgnvaldr's territories at his loss. The English pledges of protection of Rǫgnvaldr and his Irish holdings suggest that he was under immediate pressure at this period. It is possible, therefore, that the 1211/1212 seaborne devastation of Derry by Thomas fitz Roland, and the unidentified sons of Ragnall—apparently Ruaidrí and Domnall—was undertaken in support of Rǫgnvaldr's interests in Ireland. In fact, Thomas fitz Roland and Ruaidrí ransacked Derry again in 1213/1214, and it is also possible that the raids were conducted in the interests of both the Scottish and English Crowns, and specifically aimed at limiting Irish support of the Meic Uilleim dissidents. If these attacks were indeed directed against political enemies of the Scottish and English Crowns, it is not improbable that Rǫgnvaldr and his forces were also involved.