At this stage of affairs, the Duke of Clarence endeavored to open a door for the earl's reconciliation to the king. Such an attempt was indeed hopeless; but the duke, perhaps suffering some twinges of conscience on account of his treachery, sent to excuse himself for changing sides, and to entreat Warwick to make peace with Edward. His message was treated with lofty scorn. "I would rather," said the earl, "die true to myself, than live like that false and perjured duke; and I vow not, until I have either lost my life or subdued mine enemies, to lay down the sword to which I have appealed."

With a resolution not to be broken, Warwick, with Oxford leading his van, marched from Coventry; and, hoping to arrest the Yorkist army ere the king was admitted into London, he advanced southward with all speed. Learning, however, that the archbishop had proved false, and that the citizens had proved obsequious, the earl, on reaching St. Albans, halted to allow his men to repose from their fatigues, and on Saturday moved forward to Barnet, standing on a hill midway between St. Albans and London. Here the earl, resolving to await the approach of his royal foe, called a halt; and, having ordered his vanguard to take possession of the little town, he encamped on a heath known as Gladsmuir, and forming part of an extensive chase, stocked with beasts of game.

The king did not long keep the earl waiting. No sooner did the martial monarch hear that his great foe had left Coventry and was approaching the metropolis, than he girded on his armor, with a heart as fearless of the issue as had animated the mightiest of his ancestors when, on a summer morning, he marched to Evesham to strike down the puissance of Simon de Montfort. It was with no faint hopes of success, indeed, that, at the head of an army devoted to his cause, Edward, clad in magnificent armor, and mounted on a white steed, with crimson caparisons, lined with blue and embroidered with flowers of gold, rode out of London, cheered by the good wishes of the citizens, surrounded by the companions of his exile, and attended by George of Clarence, whom he could not prudently trust elsewhere, and by Henry of Windsor, whom he could not safely leave behind.

On the afternoon of Saturday Edward left London, and late in the evening of that day he reached Barnet. As the Yorkist army approached the town, the king's outriders, meeting those of the earl, chased them past the embattled tower of the church dedicated to St. John, and advanced till, through the darkness, they perceived the army of Warwick. On being informed that the earl was so near, the king ordered his army to move through Barnet, and encamped in the darkness, close to the foe, on Gladsmuir Heath. The king took up his quarters for the night in the town, and his soldiers lay on the heath. They had no sleep, however, for so near was the Lancastrian camp that the voices of men and the neighing of horses were distinctly heard.

Both armies had artillery; and Warwick's guns were, during the night, fired perseveringly at the foe. The king, it appears, did not reply to this salutation. Indeed, Edward early discovered that the Lancastrians were unaware of the exact position of the Yorkist army, and thanked his stars that such was the case; for, though Edward's intention had been to place his men immediately in front of their foes, the darkness had prevented him from perceiving the extent of Warwick's lines, and thus it happened that, while ranging his forces so as far to outstride the earl's left wing, he had failed to place them over against the right. Seldom has an error in war proved so fortunate for a general. The earl happened to have all his artillery posted in the right division of his army, and concluded that the Yorkists were within reach. Edward, as the fire from Warwick's guns flashed red through the darkness, saw the advantage he had unintentionally gained, and issued strict orders that none of his guns should be fired, lest the enemy "should have guessed the ground, and so leveled their artillery to his annoyance." This precaution was successful, and the earl's gunners thundered till daybreak without producing any effect.

Ere the first streak of day glimmered in the sky, the armies were in motion; and when the morning of Easter Sunday dawned, a flourish of trumpets and a solemn tolling from the bell of the Church of St. John aroused the inhabitants of Barnet, and announced that the game of carnage was about to begin. The weather was by no means favorable for that display of martial chivalry which, in sunshine, the field would have presented to the eyes of spectators. The morning was damp and dismal. A thick fog overshadowed the heath; and the mist hung so closely over both armies that neither Yorkists nor Lancastrians could see their foes, save at intervals. The fighting men of that age were as superstitious as their neighbors; and the soldiers on both sides concluded that the mists had been raised to favor the king by Friar Bungey, the potent magician whose spells were supposed to have raised the wind that kept Margaret of Anjou from the shores of England.

Nevertheless, at break of day the earl ordered his trumpets to sound, and proceeded to set his men in battle order. The task was one of no small delicacy; but it seems to have been performed with great judgment. Though Warwick was the soul and right arm of the Lancastrian army, the battle was so arranged as to give no umbrage to the time-tried champions of the Red Rose. The centre host, consisting chiefly of archers and bill-men, was commanded by Somerset; Oxford, who appears to have been trusted by the Lancastrians, shared the command of the right wing with the conqueror of Hexham; and, in command of the left, Exeter, who had helped to lose battle after battle, had the distinction of participating with "the setter-up and plucker-down of kings."

Meanwhile, Edward had roused himself from his repose, arrayed himself royally for the battle, placed on his head a basnet surrounded with a crown of ornament, mounted his white charger—in that age regarded as the symbol of sovereignty—and taken the field to vindicate his right to the throne of his two great namesakes who reposed at Westminster in the Confessor's Chapel.

Edward, in marshaling his army, had to contend with none of the difficulties that beset Warwick. The Yorkist army was devoted to his cause, as the chief of the White Rose; and the captains shared each other's political sympathies and antipathies. Moreover, they were the king's own kinsmen and friends—kinsmen who had partaken of his prosperity, and were eager to contribute to his triumph—friends who had accompanied him into exile, and were ready to die in his defense. Under such circumstances, the disposition of the Yorkist army was easily made. Edward, keeping the fickle Clarence and the feeble Henry in close attendance, took the command of the centre, and was opposed to that part of the Lancastrian forces commanded by Somerset. At the head of the right wing was placed Gloucester, though still in his teens, to cope with Exeter, the husband of his sister, and Warwick, the sworn friend of his sire. At the head of the left was posted Hastings, to face his brothers-in-law, Oxford and Montagu. Besides these divisions, the king kept a body of choice troops in reserve to render aid, as the day sped on, where aid should be most required.

Agreeably to the custom of the period, the king and the earl addressed their adherents, each asserting the justice of his cause—Edward denouncing the patrician hero as rebel and traitor; while Warwick branded his royal adversary as usurper and tyrant. This ceremony over, the hostile armies joined battle. At first fortune with fickle smile favored the Lancastrians. The error made by the Yorkists in taking up their position on the previous evening now caused them serious inconvenience. In fact, the Lancastrian right wing, composed of horsemen, so overlapped the king's troops opposed to them that Oxford and Montagu were enabled to crush Hastings as in a serpent's fold. The Yorkist left wing was completely discomfited; and many of the men spurred out of the fog, escaped from the field, dashed through Barnet, galloped along the high north road to London, and excused their flight by reporting that the earl had won the day.