For several years after the arrival of the confederates their ravages were confined to the provinces of Ireland, until at length, in the same year in which Ivar and Halfdan first established themselves upon [Sidenote: A. D. 866.] the coasts of East Anglia, the storm burst upon the dominions of Constantine, and from the 1st of January to St. Patrick’s day, Olave and Auisle carried fire and sword throughout the region bordering on the Forth. [Sidenote: A. D. 870.] After a lapse of four years Olave again revisited the Scottish shores, and in company with Ivar laid siege to the rock of Dumbarton, capturing and destroying the ancient bulwark of the Britons of Strath Clyde after a lengthened blockade of four months, the sole means available to an unskilful age against a _Dun_ so strongly situated. The confederates then marched southwards to join their countrymen in England; once more a king of Saxon race was sacrificed to the manes of Ragnar, and the fate of the Northumbrian Elli was inflicted upon the East Anglian martyr Edmund; nor was it until the close of the following year [Sidenote: A. D. 871.] that the allies returned to Dublin laden with the spoil of the Saxon, the Briton, and the Scot, and leaving behind them a fearful track of misery and bloodshed to mark the most lengthened and direful of all their inroads. Olave lost his life shortly afterwards in an obscure skirmish, fought, according to some accounts, in Scotland; and the death of Ivar in 873, [Sidenote: A. D. 873.] after surviving his confederate for only a few months, released the Saxon and Scottish princes from the ablest and most ruthless of their foes.[45] Amongst the earlier opponents of Olave and Ivar in the course of their Irish wars was a certain Caittil the Fair, [Sidenote: A. D. 857.] probably the same person as Ketil Biornson, who established himself in independence amongst the islands along the western coasts of Scotland belonging to the mixed Scandinavian and Gaelic race who were known under the name of the Gallgael. His daughter Auda was subsequently married to his former rival Olave, and upon the death of her husband after his return to Dublin she sought the protection of Ketil in the Hebrides, whilst her son, Thorstein the Red, early treading in the footsteps of his father, pursued the career of a Viking.[46]