It is 1098. The crusaders are poised to strike at Antioch. A second force establishes a base on Cyprus. You must Take the towns of Antioch, Acre, Jaffa, and Jerusalem and build a castle in each location (next to the red flag). You must build all four castles to be victorious. If the castles are not built and your forces are annihilated, the Muslims are victorious.
NOTE: It is rumored that the Byzantine Emperor is negotiating a peace with the Caliph of Antioch. If you breakdown the gates of this city, its castle and most of the garrison will join your cause. However, you will surely have to fight your way into Acre, Jaffa, and Jerusalem.