This was the reason for the sudden change among Christians...

This was the reason for the sudden change among Christians of Europe from their former pacifist policies, in earlier periods of their history, towards military aggression. The founder of the Crusades was Pope Urban II. He summoned the Council of Clermont, in 1095, in which the former pacifist doctrine of the Christians was abandoned. A holy war was called for, with the intent to wrest the holy lands from the hands of the Muslims.

Following the council, a huge army of Crusaders was formed, composed both of professional soldiers, and tens of thousands of ordinary people. Historians believe Urban II's venture was prompted by his desire to thwart the candidacy of a rival to the papacy. Furthermore, while European kings, princes, aristocrats and others greeted the pope's call with excitement, their intentions were basically mundane. As Donald Queller of The University of Illinois put it, "the French knights wanted more land.

Italian merchants hoped to expand trade in Middle Eastern ports... Large numbers of poor people joined the expeditions simply to escape the hardships of their normal lives."1 Along the way, this greedy mass slaughtered many Muslims, and even Jews, in hopes of finding gold and jewels. The crusaders even cut open the stomachs of those they had killed to find gold and precious stones the victims may have swallowed before they died.

So great was the material greed of the crusaders that they felt no qualms in sacking the Christian city of Constantinople (Istanbul) during the Fourth Crusade, when they stripped off the gold leaf from the Christian frescoes in the Hagia Sophia. After a long and difficult journey, and much plunder and slaughter of Muslims, this motley band called Crusaders reached Jerusalem in 1099. When the city fell after a siege of nearly five weeks, the Crusaders moved in.

They carried out a level of savagery the like of which the world has seldom seen. All Muslims and Jews in the city were put to the sword. In the words of one historian, "They killed all the Saracens and the Turks they found... whether male of female."2 One of the Crusaders, Raymond of Aguiles, boasted of this violence: Wonderful sights were to be seen.

Some of our men (and this was more merciful) cut off the heads of their enemies; others shot them with arrows, so that they fell from the towers; others tortured them longer by casting them into flames. Piles of heads, hands and feet were to be seen in the streets of the city.