Sibylla was well-positioned to wield power because Guy's authority was entirely dependent on her. She was associated with her husband in public acts in the first months of their reign, but this was cut short by Saladin's invasion. In an act of continued defiance, Raymond had retired to his fief of Galilee, allied with Saladin, and garrisoned Tiberias with Muslim troops. The sultan attacked the kingdom on 26 April 1187. After Muslim troops annihilated the combined armies of the Templars and the Hospitallers at Cresson near Nazareth on 1 May, Raymond was forced by his own vassals to submit to Guy. Though now unified, the kingdom had been critically weakened by the defeat at Cresson. The Christian army led by Guy suffered a crushing defeat at the Horns of Hattin on 4 July. The king was taken prisoner; Raynald was executed; and Raymond died of an illness in Tripoli in September.