Hereward and his men accomplished nothing more that year, but others gradually gathered in to them, including some men of note. Edwin and Morcar had once more changed sides, or had fled from William's court to escape some danger there. Edwin had been killed in trying to make his way through to Scotland, but Morcar had joined the refugees in Ely. Bishop Ethelwin of Durham was also there, and a northern thane, Siward Barn. In 1074 William advanced in person against the "camp of refuge." A fleet was sent to blockade one side while the army attacked from the other. It was found necessary to build a long causeway for the approach of the army and around this work the fiercest fighting occurred; but its building could not be stopped, and just as it was finished the defenders of the Isle surrendered. The leaders were imprisoned, Morcar in Normandy for the rest of William's reign. The common men were mutilated and released. Hereward escaped to sea, but probably afterwards submitted to William and received his favour. Edric the Wild, who had long remained unsubdued on the Welsh borders, had also yielded before the surrender of the Isle of Ely, and the last resistance that can be called in any sense organized was at an end. The comparatively easy pacification of the land, the early submission to their fate of so strong a nation, was in no small degree aided by the completeness with which the country was already occupied by Norman colonies, if we may call them so. Probably before the surrender of Ely every important town was under the immediate supervision of some Norman baron, with a force of his own. In all the strategically important places fortified posts had been built and regular garrisons stationed. Even the country districts had to a large extent been occupied in a similar way. It is hardly probable that as late as 1072 any considerable area in England had escaped extensive confiscations. Everywhere the Norman had appeared to take possession of his fief, to establish new tenants, or to bring the old ones into new relations with himself, to arrange for the administration of his manors, and to leave behind him the agents who were responsible to himself for the good conduct of affairs. If he made but little change in the economic organization of his property, and disturbed the labouring class but slightly or not at all, he would give to a wide district a vivid impression of the strength of the new order and of the hopelessness of any resistance.