Many of the barons waited upon King Henry, and demanded a conference, or parlement, for the purpose of preparing terms of peace. The plain on which the assembly met was bounded by hills, on which were posted a large body of English troops. These, who had been informed of the object of the conference, called out loudly to the king, "Place no faith in them, King Henry, they want to lay a snare for you: we will give thee our assistance, and will follow thee to the assault. Make no peace with the traitor until he falls into thy hands." The warning appears to have produced its effect, and no reconciliation took place between the belligerents. The fortress of Bridgenorth at length capitulated, and the king's forces marched through a densely-wooded country to attack the earl in his stronghold of Shrewsbury. A short interval elapsed, and then this fortress also was taken; and Earl Robert, who was made a prisoner was banished from the country, with the forfeiture of the whole of his estates. Other nobles, who had adhered to the cause of Robert of Normandy, were afterwards prosecuted, and met with a similar fate to that of the Earl of Shrewsbury.

The English troops of Henry had long sought for an opportunity of vengeance upon the oppressors of their country, and they might not unreasonably feel elated at the victories they had obtained over the Norman insurgents. It does not appear, however, that the nation at large derived any benefit from the suppression of the rebellion. Although Henry was bred in England, and had married an English wife, his sympathies were not with the people whom he governed. The old historians tell us that the good Queen Matilda used all the influence she possessed to advance the happiness and secure the liberties of her countrymen; but her counsel and entreaties do not seem to have produced any effect upon the conduct of the king. The condition of the people soon after the marriage of Henry with Matilda is thus described in the Anglo-Saxon Chronicle:—"It is no easy matter to relate all the miseries with which the land was at this time afflicted, by unjust and continual exactions. Wherever the king went, those in his train oppressed the people, and were guilty of murder and incendiary fires in many places."

Alarmed for the safety of his adherents, Robert, without hesitation, came over to England, accompanied only by a small escort, and placed himself unreservedly in his brother's power for the purpose of pleading the cause of the proscribed nobles.

At this time Robert resigned his pension of two thousand pounds. According to some historians, he was detained by Henry as a prisoner, and the pension was the price paid by the duke for his liberty; while another account states that the sum was given as a present to the Queen Matilda. It is, however, certain that Robert soon returned to Normandy without having succeeded in the object of his visit.

The Duke of Normandy was ill-fitted to restrain the excesses of his turbulent barons, or to hold with a firm hand the reins of government. Many disorders sprang up in his duchy, and were left unnoticed or unpunished by the sovereign. The fair Sibylla died in 1102, and since that time the duke had resumed his irregular way of life, and had shown more completely than ever his utter incapacity for the management of public affairs.

King Henry took advantage of this state of things to interfere in the disputes of the Norman barons; and, after appearing for a time in the character of a mediator, he at length threw off the mask, and declared himself the protector of the duchy against the maladministration of his brother. He summoned Robert to give up possession of the duchy in return for an annual payment of money. The duke indignantly refused to comply with the demand, and Henry prepared to dispossess his brother by force.

In the year 1105 the king entered Normandy with an army, and captured several castles and fortified places. Robert, however, was not without means of defence; some few nobles of power and influence still remained attached to his cause, and Henry returned to England, having added Caen and Bayeux to his possessions.

A second campaign was opened in the following year, and Henry crossed the Channel with a more formidable armament than before. He appeared before Tenchebrai, an important stronghold, situated at a few leagues' distance from Mortain. Having in vain attempted to corrupt the garrison with gold, the king laid siege to the castle with his whole army. Messengers came to Robert with the news that his troops were hard pressed by the enemy, and the duke promised that, in defiance of every obstacle, he would come on a certain day to their assistance. The promise was redeemed; and, at the time appointed, the duke, with a small but gallant band of troops, attacked the army of his brother. Placing himself at the head of his knights he dashed in upon the English infantry, which gave way before him in disorder. So impetuous was the charge, that the fortune of the day seemed likely to be in favour of Robert, when the cowardice or treachery of the Earl of Shrewsbury turned the tide of affairs. De Belesme, whose troops formed an important division of the army of the duke, suddenly fled from the field. A panic ensued among the Normans, and the brilliant deeds of valour performed by their leader failed to restore their courage or to secure the victory. After a desperate resistance, Robert was taken prisoner, with many of the chief nobles who had fought under his banner.

Edgar Atheling, who was serving in the Norman army, also fell into the hands of Henry. At the instance of the queen, his niece, a pension was granted to him, and he is related to have passed the rest of his days on a small farm in England, where he lived in obscurity, and no historian has noted the time of his death or the place of his burial.

In 1106 a harder fate was reserved for the Duke of Normandy. He was confined in Cardiff Castle, which stood near to that of Gloucester, and had recently been conquered from the Welsh. At first some degree of liberty was permitted to him, and he was allowed to take exercise among the fields and woods of the neighbourhood. On one occasion, however, he made an attempt to escape on horseback, but was pursued and taken in a marsh, which he had attempted to cross in his flight. It is related by some historians that, to prevent the possibility of another attempt of the same kind, the king ordered his brother's sight to be destroyed by a painful operation. In this miserable condition, with light and liberty alike shut out, the once gay and gallant Duke of Normandy lingered on for twenty-eight years, without quitting his prison. He died in 1135.