How did the Crusaders behave toward the people they were going to fight?

The Crusaders were very cruel against the MUSLIMS in Spain. The leader of the CHRISTIANS ie. the (POPE). was forced to tell a lie to the rulers of German, France as well as Britain and the war was held in the region of SPAIN. The MUSLIMS were badly injured during the war. It was said IN THE HISTORY that the blood of MUSLIMS were allowed to flow on wells and the region of Jerusalem.