What were the basic movements that lay behind the development of the crusades in Western Christendom?

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The basic movements that lay behind the development of the crusades were pilgrimage and holy war. Western Christians saw pilgrimage to Jerusalem as a religious duty and were outraged by the Islamic takeover of the holy city. They believed that recapturing Jerusalem was God's will and that participating in a holy war (crusade) would bring salvation.

What Were the Basic Movements That Lay Behind the Development