Duke Robert's squandering of his resources soon brought him to a want of ready money intolerable to a prince of his nature, and his mind turned at once with desire to the large sum in cash which his father had left to Henry. But Henry was not at all of the stamp of Robert. He was perfectly clear headed, and he had no foolish notions about the virtue of generosity. He preferred to buy rather than to give away. A bargain was struck between them, hardly six months after their father's death, and the transaction is characteristic of the two brothers. For three thousand pounds of silver, Henry purchased what people of the time regarded as a third of Robert's inheritance, the lordship of the Cotentin, with its important castles, towns, and vassals. The chroniclers call him now Count of the Cotentin, and he there practised the art of government for a time, and, in sharp contrast to Robert, maintained order with a strong hand. During the same summer of 1088, Henry crossed over to England to get possession of the lands of his mother Matilda, which she had bequeathed to him on her death. This inheritance he does not seem to have obtained, at least not permanently; but there was no quarrel between him and William at that time. In the autumn he returned to Normandy, taking with him Robert of Bellême. Robert had been forgiven his rebellion by the king, and so clear was the evidence that Henry and Robert of Bellême had entered into some kind of an arrangement with King William to assist his designs on Normandy, or so clear was it made to seem to Duke Robert, that on their landing he caused them both to be arrested and thrown into prison. On the news of this the Earl of Shrewsbury, the father of Robert of Bellême, crossed over from England to the aid of his son, and a short civil war followed, in the early part of the next year, in which the military operations were favourable to the duke, but his inconstancy and weakness of character were shown in his releasing Robert of Bellême at the close of the war as if he had himself been beaten. Henry also was soon released, and took up again his government of the Cotentin.