The arrival of two hundred and forty ships in the Humber, under the command of Jarl Osbern, the Danish king’s brother, summoned Edgar and his partizans in the following autumn to make one more effort to free their native land from the Norman yoke, even at the cost of delivering it to the Danes; and the united armies, marching upon York, stormed the two Norman castles, putting more than three thousand soldiers to the sword, when the Danes, satisfied with the amount of their success, returned at once to their ships, whilst Edgar and his adherents lost no time in again retiring beyond the Tyne. On receiving the intelligence of the destruction of his castles, and the lamentable slaughter of his men, William swore to exact a fearful vengeance, and with unflinching rigour he fulfilled his oath. He soon discovered the proper weapons for combating Jarl Osbern, who was ready to sacrifice the interest of his brother for his own personal emolument; and it was secretly arranged that the hostilities of the Danish admiral should be limited during the winter to pillaging the coast, and that in the following spring he should return to Denmark without offering any serious opposition to the movements of the Norman king. Secure against attack from Jarl Osbern, William marched to the north, giving over the whole country between the Humber and the Tyne throughout the ensuing winter to the unbridled license of his soldiery.[154] [Sidenote: A. D. 1070.] With the approach of spring he returned to the south, to institute a searching and rigorous scrutiny into the coffers of the English monasteries; but scarcely were the inhabitants of the devastated provinces relieved from the presence of the Norman army, than they were destined to experience a repetition of their sufferings from a sudden invasion of the Scots. In the confusion of the period Malcolm had seized upon Cumberland, retaining it hitherto by open force, and its possession enabling him to penetrate into England without crossing the territories of his Northumbrian allies, he poured his followers down the Vale of Teesdale into the North Riding of Yorkshire. At a spot known as “the Hundred Springs,” long since covered by the luxuriant woods of Castle Howard, he reached the limits of his incursion, and dispatching homewards a portion of the army laden with the plunder of the expedition, he sought to entice the population of the districts which had hitherto been spared, from the caves and forests to which they had hurriedly fled on the first tidings of his inroad. The stratagem of the Scottish leader was only too successful, and the miserable inhabitants of Cleveland, Hartness, and the eastern coasts of Durham, were soon startled from their fancied security by the unexpected approach of the very army which they had vainly imagined to have quitted the country, and to have been already far advanced on its homeward march towards the north.[155]