The Danish conquest made a profound impression on Alfred, and stimulated him to renewed efforts to preserve what still remained of Christian civilization. His whole subsequent life was spent in actual war with the Northmen, or in preparations for war. It was remarkable that he succeeded as well as he did, for after all he was the sovereign of scarcely half the territory that Egbert had won, and over which his grandfather and father had ruled. He preserved Wessex; and in preserving Wessex he saved England, which would have been replunged in barbarism but for his perseverance, energy, and courage. That Danish invasion was a chastisement not undeserved, for both the clergy and the laity had become corrupt, had been enervated by prosperity. The clergy especially were lazy and ignorant; not one in a thousand could write a common letter of salutation. They had fattened on the contributions of princes and of the credulous people; they saw the destruction of their richest and proudest abbeys, and their lands seized by Pagan barbarians, who settled down in them as lords of the soil, especially in Northumbria. But Alfred at least arrested their further progress, and threw them on the defensive. He knew that the recovery of the conquests which the Saxons had made was a work of exceeding difficulty. It was necessary to make great preparations for future struggles, as peace with the Danes was only a truce. They aimed at the complete conquest of the island, and they sought to rouse the hostility of the Welsh.