The King believing all was lost, did what he could by threats and gentle words to stop the flight of his men, but found it impossible: then he commanded two bodies of horse, which were placed on either wing, to join, and, wheeling about, to attack the enemy in rear.

The Duke, who thought himself so near a victory, was forced to stop his pursuit; and ordering his men to face about, began the fight anew; mean time the scattered parts of the main body, which had so lately fled, began to rally, and pour in upon the Normans behind, by which Duke Robert's army was almost encompassed; yet they kept their ground awhile, and made several charges, until at length, perfectly overborne by numbers, they were utterly defeated.

There Duke Robert, doing all the parts of a great captain, was taken prisoner, together with the Earl of Mortaigne, and almost his whole army: for being hemmed in on all sides, few of them could make their escape.

Thus, in the space of forty years; Normandy subdued England, and England Normandy; which are events perhaps hardly to be paralleled in any other ages or parts of the world.
1107.
The King, having stayed a while to settle the state of Normandy, returned with his brother into England, whom he sent prisoner to Cardiff Castle, with orders that he should be favourably used, which, for some time, were duly observed; until being accused of attempting to make his escape (whether it were real or feigned) he had his eyes put out with a burning basin, by the King's express commands; in which miserable condition he lived for six-and-twenty years.
It is believed the King would hardly have engaged in this unnatural and invidious war, with so little pretence or provocation, if the Pope had not openly approved and sanctified his cause, exhorting him to it as a meritorious action; which seems to have been but an ill return from the Vicar of CHRIST to a prince who had performed so many brave exploits for the service of the Church, to the hazard of his person, and ruin of his fortune.

But the very bigoted monks, who have left us their accounts of those times, do generally agree in heavily taxing the Roman court for bribery and corruption.