 Matilda stayed at Arundel Castle, while Robert marched north-west to Wallingford and Bristol, hoping to raise support for the rebellion and to link up with Miles of Gloucester, who took the opportunity to renounce his fealty to the King and declare for Matilda.Stephen responded by promptly moving south, besieging Arundel and trapping Matilda inside the castle.Stephen then agreed to a truce proposed by his brother, Henry of Blois; the full details of the agreement are not known, but the results were that Matilda and her household of knights were released from the siege and escorted to the south-west of England, where they were reunited with Robert of Gloucester.