With Douglas, the Earl of Westmoreland, Baron of Kinderton, Sir Richard Vernon, and other knights were captured.

Westmoreland, Kinderton, and Vernon were at once executed on the field of battle, as rebels; but Douglas, as a foreign knight, was simply viewed as a prisoner of war, and was kindly treated.
Glendower took no advantage of the opportunity for striking a blow at the royal army; and instead of attacking it, when spent by fatigue and encumbered with wounds, retired at once to Wales.

Had he, instead of doing this, marched to meet Sir Edmund Mortimer, who was hurrying forward with a powerful array, the united force would have been fully double the strength of the English army; and a great commander would, at once, have fought a battle that would probably have altered the whole course of events in England.

Glendower's conduct here showed that, although an able partisan leader in an irregular warfare, he had no claim whatever to be considered a great general.
Travelling rapidly, Oswald and his party crossed the Tyne; and hearing that the earl, now recovered from his illness, was marching down with his army to join his son, they rode to meet him.

It was a painful duty that Oswald had to discharge, and the old earl, when he heard of the defeat of the army, the death of the son to whom he was deeply attached, and the capture of his brother, the Earl of Westmoreland, gave way to despair, dismissed his army to their homes at once, and retired, completely broken down in body and spirit, to his castle at Warkworth.
So depressed was he that when royal messengers arrived, summoning him in the king's name to surrender, and journey with him to London, he instantly obeyed.