King William I established a fortified camp at Beugy, about 800 metres north of the castle, manned by William's best household knights under the command of Alan Rufus. The siege did not go well, the castle proving to be well-defended. Wealthy Norman and English lords were frequently captured. After a year, Alan handed command to another Breton, who was later slain, along with many of the king's knights, aggrieving William sufficiently to come to terms with the commander of the castle.
