The English king was occupied during the following year in repressing the rebellion of Edwin and Morkar, [Sidenote: A. D. 1071.]and in crushing the attempt made by the latter earl to maintain a stand in conjunction with Hereward, Siward Beorn, and Aylwyn bishop of Durham, amid the fens and marshes surrounding Ely; but the invasion of Malcolm was neither forgotten nor forgiven, and towards the close of the next summer [Sidenote: A. D. 1072. August.] William marched to the north with a formidable array of mounted chivalry, supported by a numerous fleet, in the full determination of exacting vengeance, both for the open hostility of the Scottish king, and for the support invariably afforded in the same quarter to his disaffected subjects beyond the Humber. If he had expected to find any of the insurgents in Scotland, he was doomed, on this occasion, to disappointment, as they had undoubtedly escaped elsewhere on the first rumours of the magnitude of the expedition.[160] Edgar was apparently in Flanders,[161] a country which, ever since the accession of Robert the Frison, had become the asylum of all who fled from the wrath of the Conqueror; as the connection of the count, by marriage, with the Danish and French kings, both at enmity with the king of England, as well as the assistance rendered by William to the nephew of Robert in his attempts upon the appanage of his uncle, caused a ready welcome to be accorded in Flanders to all who were disposed to assist the count in his attacks upon the duchy of Normandy.