At no former period,—not even at the height of the tyranny of Turgesius,—was a capable Prince more needed in Erin. The new generation of Northmen were again upon all the estuaries and inland waters of the Island. In the years 923-4 and 5, their light armed vessels swarmed on Lough Erne, Lough Ree, and other lakes, spreading flame and terror on every side. Clonmacnoise and Kildare, slowly recovering from former pillage, were again left empty and in ruins. Murkertach, the base of whose early operations was his own patrimony in Ulster, attacked near Newry a Northern division under the command of the son of Godfrey (A.D. 926), and left 800 dead on the field. The escape of the remnant was only secured by Godfrey marching rapidly to their relief and covering the retreat. His son lay with the dead. In the years 933, at Slieve Behma, in his own Province, Murkertach won a third victory; and in 936, taking political advantage of the result of the great English battle of Brunanburgh, which had so seriously diminished the Danish strength, the Roydamna, in company with the King, assaulted Dublin, expelled its garrison, levelled its fortress, and left the dwellings of the Northmen in ashes. From Dublin they proceeded southward, through Leinster and Munster, and after taking hostages of every tribe, Donogh returned to his Methian home and Murkertach to Aileach. While resting in his own fort (A.D. 939), he was surprised by a party of Danes, and carried off to their ships, but, says the old translator of the Annals of Clonmacnoise, "he made a good escape from them, as it was God's will." The following season he redoubled his efforts against the enemy. Attacking them on their own element, he ravaged their settlements on the Scottish coasts and among the isles of Insi-Gall (the Hebrides), returned laden with spoils, and hailed with acclamations as the liberator of his people.