Although from all accounts it would appear that many parts of the prince's conduct gave great pain and offence to his father, yet we find that Henry IV. never scrupled to entrust to his care some of the greatest and most important military operations of his reign. Whether the prince had already displayed the qualities of a soldier, in a degree sufficient to attract the notice of his father, or whether the king sought only to habituate him early to that inevitable career of arms which was in those days one of the misfortunes of royalty, we are not informed; but so early as his sixteenth or seventeenth year he fought at the battle of Shrewsbury, in which Henry Hotspur was slain. What was the part assigned to the prince on this occasion I do not find stated precisely; but all accounts agree that he proved of infinite assistance and service to his father, and fought long in the thickest of the battle, after having been severely wounded by an arrow in the face. The death of Percy spread dismay among his soldiers and allies, and after a fight of nearly four hours the party of Northumberland fled, leaving the king master of the field of battle, and a number of noble prisoners. Many of these were executed either at Shrewsbury or London; and the Earl of Northumberland, the chief support of the rebellion, made his peace for the time to meditate his rebellions. Owen Glendower, however, one of the confederates, was still in arms in Wales; and while Henry IV. returned in triumph to London, he despatched his eldest son, at the head of considerable forces, to reduce the Principality to obedience. The unhappy Glendower, unable to oppose the army led against him, was forced to fly, and, abandoned by his friends and followers, is said to have died of starvation among the caves and wildernesses in which he sought refuge. In the meanwhile the Prince of Wales conducted his expedition with skill and wisdom; the whole country submitted to his power; and having re-established order and tranquillity, he returned to London with honor and praise.