[PzLdr]

They wiped out the Abassid Caliphate, as well as the Assassins, and took Antioch. They sought an alliance with the Crusader states,but were rebuffed (an act of stupidity that went a long way to facilitating their eventual destruction. The Mongols were stopped south of the Dead Sea around 1260, when Kedbuga, or Kit Boga, was defeated by the Mamelukes of Egypt. Interestingly enough, dynastic succession issues to the Kha Khanate, between Kubilai and his younger brother. Arik Boka, coupled with a war between the Golden Horde (converted to Islam under Berke Khan) and Kubilai's other brother, Hulegu (Buddhist) prevented the Mongols from renewing their attack on the Muslims.

[Bombard]

It is a little known fact that a sizable number of Mongols were Nestorian Christians. As far as the Crusader states by the time the Mongols arrived on the scene the Christian states were in severe decline. They were in no real shape to take advantage of the Mongol presence.