The first and most obvious work which now lay before Henry was the conquest of England, and the plans which had been earlier formed for this object and deferred by these events were at once taken up. By the end of June the young bridegroom was at Barfleur preparing to cross the channel with an invading force. But he was not to be permitted to enjoy his new fortunes unchallenged. Louis VII in particular had reasons for interfering, and the law was on his side. The heiress Eleanor had no right to marry without the consent of her feudal suzerain. A summons, it is said, was at once served on Henry to appear before the king's court and answer for his conduct,[44] and this summons, which Henry refused to obey, was supported by a new coalition. Louis and Eustace were again in alliance, and they were joined by Henry's own brother Geoffrey, who could make considerable trouble in the south of Henry's lands, by Robert of Dreux, Count of Perche, and by Eustace's cousin Henry, Count of Champagne. Stephen's brother Theobald had died at the beginning of the year, and his great dominions had been divided, Champagne and Blois being once more separated, never to be reunited until they were absorbed at different dates into the royal domain. This coalition was strong enough to check Henry's plan of an invasion of England, but it did not prove a serious danger, though the allies are said to have formed a plan for the partition of all the Angevin empire among themselves. For some reason their campaign does not seem to have been vigorously pushed. The young duke was able to force his brother to come to terms, and he succeeded in patching up a rather insecure truce with King Louis. On this, however, he dared to rely enough--or perhaps he trusted to the situation as he understood it--to venture at last, in January, 1153, on his long-deferred expedition to recover his mother's kingdom. Stephen had begun the siege of the important fortress of Wallingford, and a new call for aid had come over to Normandy from the hard-pressed garrison.