In the mean time, Prince Richard had assembled his adherents too, and had commenced his march to the northward to meet his enemies. He took his two oldest sons with him, the two that wrote the letter quoted in the last chapter. One of these you will recollect was Edward, Earl of Marche, and the second was Edmund, Earl of Rutland. Edward was now about eighteen years of age, and his brother Edmund about seventeen. One would have said that at this period of life they were altogether too young to be exposed to the hardships, fatigues, and dangers of a martial campaign; but it was the custom in those times for princes and nobles to be taken with their fathers to fields of battle at a very early age. And these youthful warriors were really of great service too, for the interest which they inspired among all ranks of the army was so great, especially when their rank was very high, that they were often the means of greatly increasing the numbers and the enthusiasm of their fathers' followers. Edward, indeed, was in this instance deemed old enough to be sent off on an independent service, and so, while the prince moved forward with the main body of his army toward the north, he dispatched Edward, accompanied by a suitable escort, to the westward, toward the frontiers of Wales, to assemble all the armed men that he could find in that part of the kingdom who were disposed to espouse his cause. Edmund, who was a year younger than Edward, went with his father. The prince proceeded to the city of York, which was then a fortified place of great strength. The engraving gives a very good idea of the appearance of the walls in those times. These walls remain, indeed, almost entire at the present day, and they are visited a great deal by tourists and travelers, being regarded with much interest as furnishing a very complete and well-preserved specimen of the mural fortifications of the Middle Ages. Such walls, however, would be almost entirely useless now as means of defense, since they would not stand at all against an attack from modern artillery. The great church seen over the walls, in the heart of the city, is the famous York minster, one of the grandest Cathedral churches in England. It was a hundred and fifty years in building, and it was completed about two centuries before Richard's day. When Prince Richard reached York, he entered the town, and established himself there, with a view of waiting till his son should arrive with the re-enforcements which he had been sent to seek in the western part of England. [Illustration: WALLS OF YORK.]