kingdom ever produced from its own resources, but still outmatched by the Muslims—advanced, the Ayyubids unexpectedly moved down the stream of Ain Jalut. After a few Ayyubid raids—including attacks on Zir'in, Forbelet, and Mount Tabor—the Crusaders still were not tempted to attack their main force, and Saladin led his men back across the river once provisions and supplies ran low. Saladin still had to exact retribution on Raynald, so he twice besieged Kerak, Raynald's fortress in Oultrejordain. The first time was in 1183, following his unsuccessful campaign into Galilee, but a relief force caused him to withdraw. He opened his campaign of 1184 with a second siege of Kerak, hoping this time to draw the Crusader army into battle on open ground, but they outmaneuvered him and successfully relieved the fortress. Following the failure of his Kerak sieges, Saladin temporarily turned his attention back to another long-term project and resumed attacks on the territory of Izz ad-Din (Mas'ud ibn Mawdud ibn Zangi), around Mosul, which he had begun with some success in 1182. However, since then, Masʻūd had allied himself with the powerful governor of Azerbaijan and Jibal, who in 1185 began moving his troops across the Zagros Mountains, causing Saladin to hesitate in his attacks. The defenders of Mosul, when they became aware that help was on the way, increased their efforts, and Saladin subsequently fell ill, so in March 1186 a peace treaty was signed. Meanwhile, Raynald retaliated for the earlier sieges of Kerak by looting a caravan of pilgrims on the Hajj during the winter of 1186-7. According to the later 13th-century Old French Continuation of William of Tyre, Raynald captured Saladin's sister in a raid on a caravan; this claim is not attested in contemporary sources, Muslim or Frankish, however, instead stating that Raynald had attacked a preceding caravan, and Saladin set guards to ensure the safety of his sister and her son, who came to no harm. This precipitated Saladin's invasion of the Kingdom of Jerusalem in the summer of 1187. On 4 July 1187, Saladin faced the combined forces of Guy of Lusignan, King Consort of Jerusalem, and Raymond III of Tripoli at the Battle of Hattin. In this battle alone the Crusader force was largely annihilated by Saladin's determined army. It was a major disaster for the Crusaders and a turning point in the history of the Crusades. Saladin captured Raynald and was