With William's return to England began the long and difficult task of bringing the country completely under his control. But this was not a task that called for military genius. Patience was the quality most demanded, and William's patience gave way but rarely. There was no army in the field against him. No large portion of the land was in insurrection. No formal campaign was necessary. Local revolts had to be put down one after another, or a district dealt with where rebellion was constantly renewed. The Scandinavian north and the Celtic west were the regions not yet subdued, and the seats of future trouble. Three years were filled with this work, and the fifteen years that follow were comparatively undisturbed. For the moment after his return, William was occupied with no hostilities. The Christmas of 1067 was celebrated in London with the land at peace, Normans and English meeting together to all appearance with cordial good-will. A native, Gospatric, was probably at this time made Earl of Northumberland, in place of Copsi, who had been killed, though this was an exercise of royal power in form rather than in reality, since William's authority did not yet reach so far. A Norman, Remigius, was made Bishop of Dorchester, in place of Wulfwig, who had died while the king was in Normandy, and William's caution in dealing with the matter of Church reform is shown in the fact that the new bishop received his consecration from Stigand. It is possible also that another heavy tax was imposed at this time. But soon after Christmas, William felt himself obliged to take the field. He had learned that Exeter, the rich commercial city of the south-west, was making preparations to resist him. It was in a district where Harold and his family had had large possessions. His mother was in the city, and perhaps others of the family. At least some English of prominence seem to have rallied around them. The citizens had repaired and improved their already strong walls. They had impressed foreigners, merchants even, into their service, and were seeking allies in other towns. William's rule had never yet reached into that part of England, and Exeter evidently hoped to shut him out altogether. When the king heard of these preparations, he acted with his usual promptitude, but with no sacrifice of his diplomatic skill. The citizens should first be made to acknowledge their intentions. A message was sent to the city, demanding that the oath of allegiance to himself be taken. The citizens answered that they would take no oath, and would not admit him within the walls, but that they were willing to pay him the customary tribute. William at once replied that he was not accustomed to have subjects on such conditions, and at once began his march against the city. Orderic Vitalis thought it worthy of note, that in this army William was using Englishmen for the first time as soldiers.