Stronghold Crusader | Mission 6 - The Endless Desert 

Set in the 11th to 12th centuries, Stronghold Crusader recreates the campaigns of Christian empires and the Papacy against Islamic forces in the Holy Land, the birthplace of Christianity.
The First Crusade depicts Christian armies marching through Byzantium and Asia Minor to Jerusalem, including Templars, ultimately liberating the Holy Land from Islamic control.
Saladin's Campaign and the Kings' Crusade occur during the Third Crusade, where Arabian forces recapture Jerusalem. Despite deep European incursions into Arabia, neither side achieves a decisive victory, leading to a peace treaty granting mutual religious access to Jerusalem.
The Crusader States campaign is a fictional scenario post-First Crusade, where influential European knights declare themselves rulers and battle for influence and wealth.