It had been arranged that Glendower should meet the allies at Lichfield; and on his being joined by his uncle, the Earl of Westmoreland, with his following, Hotspur marched south. His intention was, after effecting a junction with Glendower, to march and give battle to the army with which Henry and the Prince of Wales were advancing against him. At Lichfield, however, he learned that Glendower had not completed his preparations in sufficient time to join him. He therefore changed his direction, and made for Shrewsbury, towards which place Glendower was marching.

Percy's array had swollen as he went south. He had been joined by a number of archers, from Cheshire, and by other adherents of the late king; these regarding the war as an attempt, not to place the Earl of March upon the throne, but to overthrow the usurper who had dethroned their king.

Oswald rode with sixty spearmen from his own estate; while his father, with thirty men from Yardhope, rode in his company. Both regarded the failure of Glendower to come to the place appointed as a serious misfortune.

"Of course," Oswald said, "if he joins us at Shrewsbury, before the king comes up, it will not matter much; and indeed would be, in one respect, the better. Mortimer with his force will be coming on; and though he is scarce likely to arrive at Shrewsbury in time for the battle, for he could not leave Wales, to summon his levies to the field, until the Prince of Wales had drawn off his force and marched to join his father; his reinforcement, afterwards, will fill up the gaps in our ranks, and be a great assistance, should Henry be able to rally another army in the Midlands. He cannot hope to do so before we reach London."

"That sounds fairly, Oswald, but 'tis always better to carry out the plans you have made; and this absence of Glendower, at the point arranged, to my mind augurs ill."

Henry was an able general. Believing that the Percys would make for the Welsh border, he had posted himself at Burton-on-Trent; but as soon as he heard that they had changed their course he started for Shrewsbury, and marched so quickly that he arrived there before Hotspur, thus throwing himself between the Percys and the Welsh.

Hotspur, on arriving near the town, was enraged at hearing that Glendower had not arrived, according to his promise. The king's army was encamped on the eastern side of the town, and the northern forces took post a short distance away. That night Hotspur sent a document into the royal camp, declaring Henry to be forsworn and perjured: in the first place because he had sworn, under Holy Gospel, that he would claim nothing but his own proper inheritance, and that Richard should reign to the end of his life; secondly, because he had raised taxes and other impositions, contrary to his oath, and by his own arbitrary power; thirdly, because he had caused King Richard to be kept in the castle of Pontefract, without meat, drink, or fire, whereof he perished of hunger, thirst, and cold. There were other clauses, some of them regarding his conduct to Sir Edmund Mortimer. The claims of the young Earl of March to the throne were also set forward, and the document ended with a defiance.

Henry simply sent, as reply, that he had no time to lose in writing; but that he would, in the morning, prove in battle whose claims were false and feigned.

Nevertheless, in the morning, when the two armies were arrayed in the order of battle, the king sent the Abbot of Shrewsbury to propose an amicable arrangement. Hotspur and Douglas, however, rejected the offer. The trumpets then blew on either side, and the armies joined battle.

Their numbers were about equal. Each consisted of some fourteen thousand men. Douglas and Hotspur had taken their place in the centre of their line, having behind them a party of their best knights. These charged with fury down upon the king's standard, which stood in the centre of his array. Hotspur and Douglas, his former rival, were accounted two of the best knights in Christendom, and the fury of their charge was irresistible. The centre of the royal line was cleft in sunder, the king's guards were at once dispersed; and, had not Henry taken the precaution of arraying himself in plain armour, while two of his knights had put on royal surcoats, the battle would at once have been decided.