Hereward the Last of The English by Charles Kingsley

The coasts of Ireland were in a state of comparative peace in the middle of the eleventh century. The ships of Loghlin, seen far out at sea, no longer drove the population shrieking inland. Heathen Danes, whether fair-haired Fiongall from Norway, or brown-haired Dubgall from Denmark proper, no longer burned convents, tortured monks for their gold, or (as at Clonmacnoise) set a heathen princess, Oda, wife of Thorgill, son of Harold Harfager, aloft on the high altar to receive the homage of the conquered. The Scandinavian invaders had become Christianized, and civilized also, -- owing to their continual intercourse with foreign nations, -- more highly than the Irish whom they had overcome. That was easy; for early Irish civilization seems to have existed only in the convents and for the religious; and when they were crushed, mere barbarism was left behind. And now the same process went on in the east of Ireland, which went on a generation or two later in the east of Scotland.

The Danes began to settle down into peaceful colonists and traders. Ireland was poor; and the convents plundered once could not be plundered again. The Irish were desperately brave. Ill-armed and almost naked, they were as perfect in the arts of forest warfare as those modern Maories whom they so much resembled; and though their black skenes and light darts were no match for the Danish swords and battle-axes which they adopted during the middle age, or their plaid trousers and felt capes for the Danish helmet and chain corslet, still an Irishman was so ugly a foe, that it was not worth while to fight with him unless he could be robbed afterwards. The Danes, who, like their descendants of Northumbria, the Lowlands, and Ulster, were canny common-sense folk, with a shrewd eye to interest, found, somewhat to their regret, that there were trades even more profitable than robbery and murder.