The slaughter of Lord Clifford at the hands of the Duke of York is the keynote to young Clifford's subsequent ruthless hatred of the House of York. Coming up to the body of his father, Shakspeare puts these words into his mouth—

"Wast thou ordain'd, dear father,
To lose thy youth in peace, and to achieve
The silvery livery of advised age,
And in thy reverence, and thy chair-days thus
To die in ruffian battle? Even at this sight
My heart is turn'd to stone; and while 'tis mine
It shall be stony. York not our old men spares:
No more will I their babes; tears virginal
Shall be to me even as the dew to fire;
And beauty, that the tyrant oft reclaims,
Shall, to my flaming wrath, be oil and flax.
Henceforth I will not have to do with pity
Meet I an infant of the house of York,
Into as many gobbets will I cut it
As wild Medea young Absyrtus did.
In cruelty will I seek out my fame.
Come thou new ruin of old Clifford's house.
(Taking up the body.)
As old Æneas did Anchises bear,
So bear I thee upon my manly shoulders.
But then Æneas bore a living load,
Nothing so heavy as these woes of mine."

Although the Lancastrians fought bravely, nothing could withstand the superior number of the Yorkists, combined, as it was, with the military skill and impetuous valour of the Earl of Warwick, and in a short space of time there lay dead the Duke of Somerset and the Earls of Northumberland and Stafford; and the Duke of Buckingham and the Earl of Wiltshire and Ormond grievously wounded. Thus deprived of their chief leaders, the King being a mere cipher, the Lancastrians threw down their weapons and fled, Wentworth flinging down the Royal standard and spurring his horse in the direction of Suffolk. The poor King was captured; but York treated him with great courtesy and kindness, conducted him to St. Alban's Abbey, where they prayed together at the shrine of the martyr, and then went together, victor and vanquished, to London.

The Yorkists were now in the ascendant, but acted with great moderation. There were no executions and no attainders; so Clifford succeeded to the title and kept the estates. The King was again attacked by his old malady, and again was Richard of York appointed Protector; but Queen Margaret now began to exhibit her qualities, and to intrigue in politics. She was truly an able and brave woman, but vindictive and rash. She succeeded in ousting York from the Protectorship, and took measures for crushing him effectually; and again the flames of war broke out.

Lord Clifford did not, under these circumstances, sit at home brooding over his misfortunes and the bitterness of his hatred to the house of York. He was always on the alert, at London or elsewhere, attending on Councils of State or engaged in the field. He fought at Bloreheath, in 1459, and at Northampton, in 1460, on both of which occasions his party suffered a defeat; but Margaret, nothing daunted, raised an army of 18,000 men, and proceeded at their head into Yorkshire, in face of the frosts and snows of the December of 1460. The Duke of York, with a small army of 5,000 men, went from London and threw himself into Sandal Castle, by Wakefield, there to await the arrival of his son Edward, Earl of March, who was mustering forces in the Welsh Marches. The Queen came with her army upon Wakefield Green, with the Duke of Somerset, son of the slain Duke, in chief command, and Clifford and Wiltshire, son of the Earl who fell at St. Alban's, in command of ambuscades, one on each side. Then, aware of her numerical superiority, she appeared before Sandal, and summoned the Duke to come forth and fight her. "What, are you afraid of encountering an army led by a woman? Cowardly poltroon! can you be fit to wear the crown of England, who shut yourself up in a castle against a woman?" York called a council of war, and was earnestly dissuaded against running the hazard of a battle before the arrival of his son; but, taunted by the jeers of the Queen, he felt that his honour was concerned in fighting at once, despite the numerical odds, and forth he went with his small army, not one-third that of the Queen.

The Duke sallied forth and met Somerset, with a comparatively small force, on Wakefield Green, whom he attacked with great vigour, anticipating, with his better-disciplined men, an easy victory; but the ambuscades under Clifford and Wiltshire came out upon his flanks, whilst a contingent of Northern Borderers attacked his rear, and thus, completely surrounded, his small force succumbed, the White Rose drooped, and the Red, for the first time, was triumphant. This battle brought to an end the ambitious aspirations of Richard of York. He was one of the first to fall, and with him Sir Thomas Neville, Lord Salisbury's son, and Lord Harrington, the husband of Katherine Neville, his daughter. Lord Salisbury himself was wounded, but not sufficiently to prevent his galloping off from the scene. Clifford however, followed in hot pursuit, captured, and sent him to Pontefract Castle, where he was at once beheaded.

Previously, however, to his pursuit of the father, Clifford was guilty of that dastardly act upon his son, the Earl of Rutland, which has stamped his name with infamy, and has given significance to his sobriquet of "Black-faced Clifford." The Duke of York had with him, in Sandal Castle, his family, including the youthful Earl of Rutland. Boy-like, he must needs go and see the battle, and nothing could dissuade him. "I will go," said he, "and see my father kill the cruel Queen; and when I am a man I will go and fight, and kill his enemies too." "A battle is not a place, Lord Edmund," replied his tutor and chaplain, Sir Robert Aspall, "for boys. A stray arrow might kill you." "Think not, sir priest," replied the brave boy, "that a son of Richard of York is afraid of an arrow! Stay under shelter of these walls, like craven priest, if you will; I shall go and see the deeds of men who are men!" Seeing that nothing could turn the boy from his purpose, his tutor resolved to go with him to keep him out of harm's way, nothing loth himself to witness the conflict of arms. When the battle was over, and the vanquished flying, Sir Robert led his charge, away towards Sandal. They had not proceeded far, when they encountered a steel-clad warrior on horseback, with blood dropping from his sword. Perceiving from his apparel that he was a youth of distinction, the warrior dismounted, and, holding his horse by the reins, inquired who he was. "Then," as Hall says, "the young gentleman, dismayed, had not a word to speak, but kneeled on his knees, imploring mercy and desiring grace, both with holding up his hands and making dolorous countenance, for his speech was gone for fear. 'Save him,' said his chaplain, 'for he is a Prince's son, and peradventure may do you good hereafter.' With that word Lord Clifford marked him, and said, 'By God's blood! thy father slew mine, and so will I do to thee and all thy kin,' and with that word, struck the Earl to the heart with his dagger, and bade the chaplain bear the Earl's mother and brother word what he had done, and said, adding, 'By this act, Lord Clifford was accompted a tyrant and no gentleman.'"

Not satisfied with this cowardly act of vindictiveness, Lord Clifford resolved to carry his vengeful hatred on, by insulting the dead. He returned to the field, now strewn with corpses, sought for, and found that of the Duke of York, and cutting off his head, stuck it upon a lance and carried it, as the most acceptable trophy, to the tent of the Queen, who received it with ill-timed merriment and jest. She made a paper crown and placed it on the head, with an inscription—"This is he who would have been King of England," and gave directions for it to be conveyed, along with that of Salisbury, to York, and placed over one of the gates, adding, "Leave room for the head of my Lord of Warwick, for it shall soon bear them company!"

Queen Margaret, flushed with her victory, marched towards London, but met with the Earl of Warwick, in February, 1461, at St. Alban's, and there defeated him, after which the poor captive King was released and brought to his Queen in Lord Clifford's tent. But Edward, the quondam Earl of March, now Duke of York, had come up and joined Warwick, who, together, entered London and were welcomed by the citizens, who favoured the house of York. Margaret, fearing to meet their united forces, returned northward, her strongholds and most devoted friends being in the northern counties, especially on the Scottish borders, whither she was followed by Duke Edward. She had come to York, and lay there with 60,000 men, when she heard that York and Warwick had reached Pontefract with an army of 40,000 men. Anxious to prevent the passage of the Aire by the enemy, she moved to Towton, some eight miles off York, and there was fought the memorable and decisive battle which placed the crown on the head of Edward IV. The Lancastrians had seized Ferrybridge under Lord Fitzwalter, and Clifford, as courageous as he was cruel, undertook to dislodge him, which he accomplished. But Lord Falconbridge crossed the Aire three miles higher, at Castleford, and attacked Clifford in the flank with a superior force. Clifford fled towards the Queen's camp, and when he arrived at Dittingdale, two miles off Towton, feeling thirsty after his exertions, he removed his gorget and stooped to drink at a streamlet, when an arrow struck him in the throat, and the murderer of Rutland and insulter of the dead Richard of York fell to rise no more.