He made no answer to this gibe, but instead he pushed open the window and carefully surveyed the deep gorge beneath him, for this place was new to him. The night before they had come in by torch-light, over a steep bridge above a black river. The gate into the tower had been opened for them only after long parleying, but he had perceived walls well planned and formidable, great heights in the blackness, and steep, up-and-down streets amongst which they went between strong, stone houses. But he had been aware that this city of Durham was a very strong place.
He had been set to sleep that night in a room that faced inwards, and rising in the morning he had seen that just before his face were the great stones of the wall surrounding and fortifying the cathedral. Beneath his gaze were two great towers, pierced with meurtrières, which are slits through which arrows may be shot. Between these two towers was a gateway which he doubted not had a double portcullis, devices for dropping huge stones and rafters upon any enemy that should break through the first portcullis and be captured by the second, so that they would be like rats in a trap. By craning his head out of his window he could see, further along, both to his right and to his left, tall towers in this inner wall, each tower having the appearance of an arch let into its face. But this Sir Bertram was an engineer well skilled in the plans of fortresses, and he knew that what appeared to be arches led up to two slanting holes in each tower, and that the slant of each hole was directed with a fell and cunning purpose. For, to each tower foot a steep and narrow street of the town came up. So, if any enemy should have won the town itself and should come up those streets, then those in the tower would set running down these slanting holes balls of stone weighing two, three or four hundred pounds. By the direction of the slantings, those balls of stone would run bounding down those narrow streets and cause dreadful manglings, maimings and death, principally by the breaking of legs.
By those and other signs, this Sir Bertram knew that here, even within the walled town was a fortress almost impregnable and dreadful to assault. This Bishop might well be a proud and disdainful prelate. He was safe, not only from foreign foes, but from his own townsmen, which was not so often the way with Bishops. For it is the habit of townsmen to be at perpetual strife with their Bishops, seeking to break in on them by armed force and to make the Bishops give up their rights and rents and fees in the towns, which if the Bishops could not prevent was apt to render them much the poorer. But at this Prince Bishop the townsmen could never come, so strong was this citadel within the town.
So he would become ever richer, not only for that reason but because of the great shrines of St. Cuthbert and of the Venerable Bede. To these, year in, year out, at all seasons and in all weathers, thousands resorted with offerings and tolls and tributes.
So this Sir Bertram perceived it would be no easy thing to humble this Palatine Prince even though the Percy had reported to King Henry VII that he could smoke out Bishop Sherwood at very little cost.
It was true that, as the Percy thought, King Henry VII heartily desired the downfall of this Bishop Sherwood. He had supported Richard Crookback and loved little King Henry. And indeed, Sir Bertram knew, for he had the King's private thoughts, that the King would very willingly see the downfall not only of the Bishop Sherwood but of this whole see of Durham. For it was contrary to that Prince's idea of kingship to have within his realm a Palatine county with a Bishop there having such sovereign powers that it was as if there was no King at all in the realm. But, to be rid of the bishopric, even King Henry thought would be impossible since it would raise against him all the Church and get him called heretic and interdicted as King John had been. So that the King would very willingly have had the Percy to act as his catspaw and make civil war upon Bishop Sherwood and so drive him out of the land. That might impoverish and weaken the see a little, but not much. For a Bishop is not like a temporal baron; though Sherwood be cast out another must succeed him and have all his rights and grow as strong or stronger.
It was upon these things that this Sir Bertram—a cool and quiet knight, loving King Henry and beloved by him above most men—meditated whilst that old lady cast up her accounts, and he trimmed his finger nails. So, when he leaned out of that bright window, he perceived how steeply perched was the house in which he was. Sheer down to the river ran rocky paths with here and there a tree. At the bottom was a high wall well battlemented and slit for archers to hold it. The river ran very swiftly. On it there was a fisherman casting his nets from an anchored boat. The boat tugged and tore so at its chain that even the practised fisherman had difficulty to stand. So the river must be very swift, and there would be no mining there.
On the other side of the river the banks rose as steeply and were clothed with trees. There cannon might be set against the town. But to shoot so far they must be great guns and the Percy had none of these, nor were there any large enough nearer than Windsor. If the Percy had them, it was difficult to think that he could drag them there into position, and all that would take a year or two years. So, this Sir Bertram, who had been sent there by the King to advise him, considered, as his first thoughts, that if the Earl of Northumberland attacked this Bishop Palatine he might take the city, but hardly the inner citadel, and never at all the castle within. Or, if the King lent him cannon, he might break the wall of the citadel.
On the other hand, having the Bishop shut up in the castle the Earl might starve him out—but this he could not do unless all the country round were friendly to the Earl and hated the Bishop. Without that there would be no doing it. And the same might be said of any project for dragging cannon on to those heights. For the cannon must be brought up narrow valleys where ambushes very easily could lie, and that could not be thought of in a hostile country.
The Percy had reported himself to King Henry as being cock of all the North parts; if that were true, he might very well be loosed upon the Bishop. But from conversations that he had had with the Lords Dacre and Ogle, as well as with the Abbot of Alnwick and lesser men, this Sir Bertram thought it was possible that the Earl Percy was not so strong nor yet so beloved in those parts as he would have the King believe. In that case, if he relied upon this Earl and this Earl's faith, the King might get great discredit and no profit either in those parts or elsewhere. It was in order to study and inquire into these things that this cautious Sir Bertram was come into those parts. So he leaned upon the sill of the window and looked down upon the river that appeared two hundred feet below.