The Army of the Cross entered Acre on the 12th of June, 1191, and at the same time Saladin withdrew from the neighbouring heights, and proceeded a short distance into the interior to concentrate his forces. Soon afterwards Philip of France expressed his intention to return to Europe. The reason he gave for doing so was the bad state of his health; and it is not improbable that this prince, who seems to have possessed neither the occasional religious impulses nor the warlike spirit of Cœur-de-Lion, should have found the first approaches of disease sufficient to deter him from the toils and dangers of a journey to the Holy Sepulchre. Other causes were, however, at work. The title of King of Jerusalem was still a subject of dispute among the crusaders, although the city itself was now in the hands of the infidel. The crown had been assumed by Guy of Lusignan, in right of his wife Sybilla, a descendant of Godfrey of Bouillon. During the siege of Acre, Sybilla died; and her sister Isabella, who had married Conrad of Montferrat, Prince of Tyre, put in her claim to confer the title on her husband. While Philip had declared in favour of Conrad, Richard--who seems to have acted merely from the desire of opposing his ally--supported the cause of Lusignan, and acknowledged him King of Jerusalem. In this, as in every other dispute between the two monarchs, Philip was compelled to yield; but he did so with an ill grace, and it was hardly to be expected that the King of France could long submit to such a course of humiliation. He determined to return to his own country, where his will was law, and his power absolute; and where, too, he might have opportunity, during the absence of the English king, to seize upon some portion of the latter's territories, and extend the rather circumscribed limits of the French kingdom. Richard at first received the news of Philip's intended departure with a malediction, calling down shame upon his head for deserting the holy cause in which he was engaged. The feeling of anger seems soon to have given place to something like contempt, for Cœur-de-Lion added, "Let him go, if his health needs it, and he cannot live away from Paris." But the probable designs of the French king were not overlooked; and he was compelled to take an oath that he would make no aggression upon English territories during the absence of Richard in Palestine. He also agreed to leave at Acre 10,000 men, commanded by the Duke of Burgundy, but under the control of Cœur-de-Lion.