Berwick had at length fallen into the power of the Scotch; King Edward II. resolved, in 1319, to make a fresh effort to regain that town and to recommence his attempts against Scotland. On the 1st of September he laid siege to Berwick, by land and by sea; but while he was detained there by the obstinate resistance of the Lord Stewart of Scotland, Douglas and Randolph, King Robert's most faithful companions, had crossed the borders into England with fifteen thousand men, carrying their ravages as far as York, so that Edward was obliged to abandon Berwick and march against the invaders of his own dominions. The Scots escaped from him and re-entered their country; a truce of two years was concluded, and, in 1323, after several renewals of hostilities, it was followed by a new treaty which restored peace to the two countries; not, however, without leaving in England a feeling of animosity against the little country whose proud independence of spirit all their power had not been able to subdue.

King Edward had not taken warning by the fate of Piers Gaveston; he had become attached to a young man at his court, Hugh le Despencer, who had been placed at his side by his cousin the Earl of Lancaster, and whom he soon elevated to the dignity of chamberlain. A short time afterwards he married him to Eleanor de Clare, sister of the young Earl of Gloucester, who had been killed at Bannockburn; she brought him an enormous estate upon the borders of Wales. His aunt, Margaret de Clare, had enriched Gaveston in the same manner. Le Despencer was an Englishman, and Edward had perhaps hoped to enjoy his friendship in peace; but the benefits which he heaped upon his new favorite soon excited the jealousy of the barons. At their head was the Earl of Lancaster, who was enraged at seeing preferred to himself a man who had formerly been a member of his own household. An abuse of the royal authority for the benefit of the royal favorite soon furnished a pretext to the great noblemen for resisting the king's authority. They armed their vassals; the lands of the Despencers were pillaged and their castles destroyed, in 1321. Lancaster joined the insurrection, swearing not to lay down his arms before banishing the favorite. They advanced as far as St Alban's, and the earl sent a messenger to the king to announce the conditions of peace. Edward was as timid as he was stubborn; he defended his friends as well as he was able, and declared that they could not be condemned without a trial. The barons marched towards London and took up their quarters in the suburbs; Parliament was convened at Westminster; and with their arms in their hands, the Earl of Lancaster and his friends accused Hugh le Despencer and his father of having usurped the royal authority, kept the king away from his faithful barons, and illegally imposed taxes, &c. At length they demanded that they should be banished. The bishops protested that the sentence was irregular; the king gave in; the two Le Despencers left England, and the barons became so arrogant, that Queen Isabel, when making a pilgrimage to Canterbury, was refused admittance to Leeds Castle, in the county of Kent, although that fortress belonged to the crown. The governor's wife, Lady Badlesmere, even caused several arrows to be shot at the royal suite, and several of the queen's attendants were killed.

This insolence enraged the king. He punished Lord and Lady Badlesmere, and at the same time recalled the Despencers. Lancaster rallied round him all his friends and entered into a correspondence with the Scots, who promised to invade the northern provinces. This negotiation had no other effect than to crush the popularity of the Earl of Lancaster, the Scots being so much detested. The king had already attacked and defeated the Earl of Hereford and his ally, Roger Mortimer, and the latter was a prisoner in the Tower. Hereford had joined Lancaster, and the king was marching against them. The two earls had raised the siege of Tichnall Castle and were retreating before the royal army, when at Boroughbridge, on the borders of the Urc, Lancaster found the Governors of York and Carlisle with a body of troops, prepared to dispute his passage. Hereford was killed upon the bridge, and during the retreat which followed, Lancaster was made a prisoner. He was brought back in triumph to his Castle of Pontefract, and the king soon joined him there. Lancaster foresaw the fate which awaited him. "Lord," he said on being captured, kneeling before a crucifix, "I surrender to Thee, and throw myself upon Thy mercy." His conviction was certain, his treason being flagrant. Lancaster was condemned by six earls and six barons. The people insulted him while he was being led to the scaffold. He lifted his pinioned hands towards heaven. "Heavenly King, have mercy on me," he cried, "for the king of earth has abandoned me." He was beheaded on the 22nd of March, 1322. Fourteen bannerets and as many knights also suffered the extreme penalty. Mortimer was condemned to imprisonment for life. The Despencers enriched themselves with the spoils taken from the victims; the father was created Earl of Winchester, and the enmity of the people towards the favorites was increased by the compassion which the condemned men inspired. It was found necessary to forbid the people to kneel before the portrait of the Earl of Lancaster in St. Paul's Cathedral, and rumors of miracles which had taken place at his tomb were spread throughout England, as had formerly been the case with Simon of Montfort, Earl of Leicester.

Roger Mortimer had succeeded in escaping from prison, probably not without having held some communication with Queen Isabel, who resided at the Tower during his captivity. He was in France and had just entered the service of Charles the Beautiful. The queen was enraged at the execution of his uncle, the Earl of Lancaster. When her husband came back from the expedition in the North, she received him haughtily, and manifested towards the Despencers the same hostility which she had formerly displayed towards Piers Gaveston. The King of France, Charles the Beautiful, seized the pretext of the grievances of Isabel, to take possession of the greater number of the towns and castles belonging to Edward. The latter, in return, seized upon all the property which the queen held in England, declaring that she should possess nothing while in communication with his enemies.

Isabel immediately proposed to act as mediator between her brother and her husband. The weak king fell into the trap, and allowed her to depart. She was received in France with open arms, and soon informed her husband that he would have to come and do homage to the King of France for his duchy of Aquitaine. Edward was preparing to start when he was detained in England in consequence of indisposition. The Despencers, who did not dare to accompany him into France, but who would not lose sight of him, persuaded the weak monarch to cede Guienne and Ponthieu to his son, Prince Edward, the King of France promising to content himself with receiving homage from the young man. The Prince of Wales therefore followed his mother into France. But in vain did the king await the return of his wife and son, the queen was continually delaying; at length, she haughtily declared that her life was not safe in England and that the Despencers were plotting against her and her son.

King Edward, astounded, defended himself as well as he was able, causing all the prelates in England to write and reassure the queen; but she would not be convinced, and when King Charles the Beautiful, tired, no doubt, of the bad conduct of Isabel, and of the injunctions which he received from England, told his sister that he could no longer keep her at his court; she set out, surrounded by the knights who had embraced her cause, the Earl of Kent, her husband's brother, D'Artois, John of Hainault, and, still accompanied by her favorite, Mortimer, she embarked at Dort with a little army of Frenchmen and Brabantines, to land at Orcewell in Suffolk, on the 24th of September. Scarcely had she set foot upon English soil with her son, when, in spite of all the damaging rumors which were afloat concerning her, a large number of knights flocked round her standard. The people were tired of the weakness of King Edward, of the avidity of his favorites, and of the disorder which reigned over the kingdom. When Edward sent and asked for the assistance of the citizens of London, they replied that by their charters they were not obliged to follow him into battle, but that they would be faithful to the king, the queen, and the princes, by closing their gates to the foreigners. Edward was alone with the two Despencers, the Chancellor Baldock and a few knights. Scarcely had he set out for Wales, when the people of London rose, murdered the Bishop of Exeter, who had been elevated by the king to the position of governor, and sent his head to the queen. Edward had halted at Gloucester, whence he had sent old Despencer to defend Bristol; the citizens revolted, and Despencer was compelled to surrender at the discretion of Isabel. She immediately caused him to be executed as a traitor, and the old man's head was exposed to the public sight at Winchester. Hugh le Despencer and Chancellor Baldock, as well as the king, were wandering in the county of Glamorgan, where they had been shipwrecked, after having ineffectually endeavored to take refuge in Ireland. Le Despencer and the chancellor were recognized and arrested. The king immediately surrendered to his enemies, having decided to share the fate of those who loved him, and who were already condemned in anticipation.

Baldock soon died of ill-treatment, and it was necessary to hasten the execution of Hugh le Despencer. He had refused to take any food since his arrest, and he was half dead when he was dragged to the scaffold to suffer the same fate as his father. The Earl of Arundel, who had been at the head of the judges who condemned Lancaster, was beheaded with two of his friends, and their property was given to Mortimer.

The queen had arrived in London, Parliament had just met; and, on the 7th of January, 1327, the Bishop of Hereford, Adam Orleton, Isabel's adviser and able agent, asked this question of the assembly: "Should the father be re-established upon the throne, or ought the son to replace him?" He dwelt upon the weakness, the bad deeds, the treacherous acts of King Edward, and asked the lords to reply on the morrow to his question. The decision was not doubtful. While the barons were pronouncing, in the great hall of Westminster, the fall of Edward II., King of England, the people of London, assembled in crowds at the doors of the palace, loudly demanded his immediate condemnation. Several bishops alone had the courage to speak in favor of the unhappy king, who had not seen a sword drawn nor a bow stretched in his defence: they were insulted, and the Bishop of Rochester was trampled in the mud on leaving the palace. The young prince was proclaimed king by the public voice, and all the peers who were present swore allegiance to him on the spot.

When the queen was informed of the success of all her schemes, she cried bitterly. "Alas!" she said, "they have deposed my husband the king. Parliament has overstepped its authority." These hypocritical tears did not deceive anybody; the young prince, Edward, alone was touched at them. "Do not be afraid, mother," said he, "I will never deprive my father of his crown." A deputation was therefore sent to the poor king, who was a prisoner in Kenilworth Castle. When Edward II. perceived the Bishop of Hereford at the head of the embassadors, he fell to the ground, stricken with grief. The judge who had condemned the two Despencers, Sir William Trussel, advanced in the name of the Parliament, and, taking his turn to speak, told Edward that he was no longer King of England. At the same moment, Sir Thomas Blount, steward of the royal household, broke his baton, renouncing his allegiance to the king. Edward listened without complaining, and without urging anything on his own behalf, simply thanked the Parliament for having recognized the rights of his son. On the 24th of January, 1327, King Edward III. was proclaimed throughout the kingdom. Edward II. was, according to the decree of Parliament, deposed from the throne by the lords and commons, and the power was entrusted to Queen Isabel, who was to administer the affairs of the kingdom for her son, then only fifteen years of age.