Unlike the First War of Scottish Independence, in which Clann Ruaidhrí participated, Raghnall and his family are not known to have taken part in the second war (from 1332–41). In fact, Raghnall certainly appears on record by 1337, when he aided his third cousin, Eóin Mac Domhnaill I, Lord of the Isles, in the latter's efforts to receive a papal dispensation to marry Raghnall's sister, Áine, in 1337. At the time, Raghnall and Eóin were apparently supporters of Edward Balliol, a claimant to the Scottish throne who held power in the realm from 1332 to 1336. By June 1343, however, both Raghnall and Eóin were reconciled with Edward's rival, the reigning son of Robert I, David II, King of Scotland, and Raghnall himself was confirmed in the Clann Ruaidhrí lordship by the king.