The present expedition went no further north, but its influence extended further. Ethelwin, the Bishop of Durham came in and made his submission. He bore inquiries also from Malcolm, the king of Scots, who had been listening to the appeals for aid from the enemies of William, and preparing himself to advance to their assistance. The Bishop of Durham was sent back to let him know what assurances would be acceptable to William, and he undoubtedly also informed him of the actual state of affairs south of his borders, of the progress which the invader had made, and of the hopelessness of resistance. The Normans at any rate believed that as a result of the bishop's mission Malcolm was glad to send down an embassy of his own which tendered to William an oath of obedience. It is not likely that William attached much weight to any profession of the Scottish king's. Already, probably as soon as the failure of this northern undertaking was apparent, some of the most prominent of the English, who seem to have taken part in it, had abandoned England and gone to the Scottish court. It is very possible that Edgar and his two sisters, Margaret and Christina, sought the protection of Malcolm at this time, together with Gospatric, who had shortly before been made Earl of Northumberland, and the sheriff Merleswegen. These men had earlier submitted to William, Merleswegen perhaps in the submission at Berkhampsted, with Edgar, and had been received with favour. Under what circumstances they turned against him we do not know, but they had very likely been attracted by the promise of strength in this effort at resistance, and were now less inclined than the unstable Edwin to profess so early a repentance. Margaret, whether she went to Scotland at this time or a little later, found there a permanent home, consenting against her will to become the bride of Malcolm instead of the bride of the Church as she had wished. As queen she gained, through teaching her wild subjects, by the example of gentle manners and noble life, a wider mission than the convent could have furnished her. The conditions which Malcolm accepted evidently contained no demand as to any English fugitives, nor any other to which he could seriously object. William was usually able to discern the times, and did not attempt the impracticable.

William intended this expedition of his to result in the permanent pacification of the country through which he had passed. There is no record of any special severity attending the march, but certainly no one was able to infer from it that the king was weak or to be trifled with. The important towns he secured with castles and garrisons, as he had in the south. Warwick and Northampton were occupied in this way as he advanced, with York at the north, and Lincoln, Huntingdon, and Cambridge along the east as he returned. A great wedge of fortified posts was thus driven far into that part of the land from which the greatest trouble was to be expected, and this, together with the general impression which his march had made, was the most which was gained from it. Sometime during this summer of 1068 another fruitless attempt had been made to disturb the Norman possession of England. Harold's sons had retired, perhaps after the fall of Exeter, to Ireland, where their father had formerly found refuge. There it was not difficult to stir up the love of plundering raids in the descendants of the Vikings, and they returned at this time, it is said with more than fifty ships, and sailed up the Bristol Channel. If any among them intended a serious invasion of the island, the result was disappointing. They laid waste the coast lands; attacked the city of Bristol, but were beaten off by the citizens; landed again further down in Somerset, and were defeated in a great battle by Ednoth, who had been Harold's staller, where many were killed on both sides, including Ednoth himself; and then returned with nothing gained but such plunder as they succeeded in carrying off. The next year they repeated the attempt in the same style, and were again defeated, even more disastrously, this time by one of the newcomers, Brian of Britanny. Such piratical descents were not dangerous to the Norman government, nor was a rally to beat them off any test of English loyalty to William.

Even the historian, Orderic Vitalis, half English by descent and wholly so by birth, but writing in Normandy for Normans and very favourable to William, or possibly the even more Norman William of Poitiers, whom he may have been following, was moved by the sufferings of the land under these repeated invasions, revolts, and harryings, and notes at the close of his account of this year how conquerors and conquered alike were involved in the evils of war, famine, and pestilence. He adds that the king, seeing the injuries which were inflicted on the country, gathered together the soldiers who were serving him for pay, and sent them home with rich rewards. We may regard this disbanding of his mercenary troops as another sign that William considered his position secure.

In truth, however, the year which was coming on, 1069, was another year of crisis in the history of the Conquest. The danger which had been threatening William from the beginning was this year to descend upon him, and to prove as unreal as all those he had faced since the great battle with Harold. For a long time efforts had been making to induce some foreign power to interfere in England and support the cause of the English against the invader. Two states seemed especially fitted for the mission, from close relationship with England in the past,—Scotland and Denmark. Fugitives, who preferred exile to submission, had early sought the one or the other of these courts, and urged intervention upon their kings. Scotland had for the moment formally accepted the Conquest. Denmark had not done so, and Denmark was the more directly interested in the result, not perhaps as a mere question of the independence of England, but for other possible reasons. If England was to be ruled by a foreign king, should not that king on historical grounds be a Dane rather than a Norman? Ought he not to be of the land that had already furnished kings to England? And if Sweyn dreamed of the possibility of extending his rule, at such a time, over this other member of the empire of his uncle, Canute the Great, he is certainly not to be blamed.

It is true that the best moment for such an intervention had been allowed to slip by, the time when no beginning of conquest had been made in the north, but the situation was not even yet unfavourable. William was to learn, when the new year had hardly begun, that he really held no more of the north than his garrisons commanded. Perhaps it was a rash attempt to try to establish a Norman earl of Northumberland in Durham before the land had been overawed by his own presence; but the post was important, the two experiments which had been made to secure the country through the appointment of English earls had failed, and the submission of the previous summer might prove to be real. In January Robert of Comines was made earl, and with rash confidence, against the advice of the bishop, he took possession of Durham with five hundred men or more. He expected, no doubt, to be very soon behind the walls of a new castle, but he was allowed no time. The very night of his arrival the enemy gathered and massacred him and all his men but two. Yorkshire took courage at this and cut up a Norman detachment. Then the exiles in Scotland believed the time had come for another attempt, and Edgar, Gospatric, and the others, with the men of Northumberland at their back, advanced to attack the castle in York. This put all the work of the previous summer in danger, and at the call of William Malet, who held the castle for him, the king advanced rapidly to his aid, fell unexpectedly on the insurgents, and scattered them with great slaughter. As a result the Norman hold on York was tightened by the building of a second castle, but Northumberland was still left to itself.

William may have thought, as he returned to celebrate Easter at Winchester, that the north had learned a lesson that would be sufficient for some time, but he must have heard soon after his arrival that the men of Yorkshire had again attacked his castles, though they had been beaten off without much difficulty. Nothing had been gained by any of these attempts, but they must have been indications to any abroad who were watching the situation, and to William as well, that an invasion of England in that quarter might hope for much local assistance. It was nearly the end of the summer before it came, and a summer that was on the whole quiet, disturbed only by the second raid of Harold's sons in the Bristol Channel.

Sweyn of Denmark had at last made up his mind, and had got ready an expedition, a somewhat miscellaneous force apparently, "sharked up" from all the Baltic lands, and not too numerous. His fleet sailed along the shores of the North Sea and first appeared off south-western England. A foolish attack on Dover was beaten off, and three other attempts to land on the east coast, where the country was securely held, were easily defeated. Finally, it would seem, off the Humber they fell in with some ships bearing the English leaders from Scotland, who had been waiting for them. There they landed and marched upon York, joined on the way by the men of the country of all ranks. And the mere news of their approach, the prospect of new horrors to be lived through with no chance of mitigating them, proved too much for the old archbishop, Aldred, and he died a few days before the storm broke. William was hunting in the forest of Dean, on the southern borders of Wales, when he heard that the invaders had landed, but his over-confident garrison in York reported that they could hold out for a year without aid, and he left them for the present to themselves. They planned to stand a siege, and in clearing a space about the castle they kindled a fire which destroyed the most of the city, including the cathedral church; but when the enemy appeared, they tried a battle in the open, and were killed or captured to a man.

The fall of York gave a serious aspect to the case, and called for William's presence. Soon after the capture of the city the Danes had gone back to the Humber, to the upper end of the estuary apparently, and there they succeeded in avoiding attack by crossing one river or another as the army of the king approached. In the meantime, in various places along the west of England, insurrections had broken out, encouraged probably by exaggerated reports of the successes of the rebels in the north. Only one of these, that in Staffordshire, required any attention from William, and in this case we do not know why. In all the other cases, in Devon, in Somerset, and at Shrewsbury, where the Welsh helped in the attack on the Norman castle, the garrisons and men of the locality unassisted, or assisted only by the forces of their neighbours, had defended themselves with success. If the Danish invasion be regarded as a test of the security of the Conquest in those parts of England which the Normans had really occupied, then certainly it must be regarded as complete.

Prom the west William returned to the north with little delay, and occupied York without opposition. Then followed the one act of the Conquest which is condemned by friend and foe alike. When William had first learned of the fate of his castles in York, he had burst out into ungovernable rage, and the mood had not passed away. He was determined to exact an awful vengeance for the repeated defiance of his power. War in its mildest form in those days was little regulated by any consideration for the conquered. From the point of view of a passionate soldier there was some provocation in this case. Norman garrisons had been massacred; detached parties had been cut off; repeated rebellion had followed every pacification. Plainly a danger existed here, grave in itself and inviting greater danger from abroad. Policy might dictate measures of unusual severity, but policy did not call for what was done, and clearly in this case the Conqueror gave way to a passion of rage which he usually held in check, and inflicted on the stubborn province a punishment which the standard of his own time did not justify.

Slowly he passed with his army through the country to the north of York, drawing a broad band of desolation between that city and Durham. Fugitives he sought out and put to the sword, but even so he was not satisfied. Innocent and guilty were involved in indiscriminate slaughter. Houses were destroyed, flocks and herds exterminated. Supplies of food and farm implements were heaped together and burned. With deliberate purpose, cruelly carried out, it was made impossible for men to live through a thousand square miles. Years afterwards the country was still a desert; it was generations before it had fully recovered. The Norman writer, Orderic Vitalis, perhaps following the king's chaplain and panegyrist William of Poitiers, while he confesses here that he gladly praised the king when he could, had only condemnation for this deed. He believed that William, responsible to no earthly tribunal, must one day answer for it to an infinite Judge before whom high and low are alike accountable.