That would be a Crusade. The first crusade occurred in 1095 or so and there were crusades over the next 200 years.
Well, the Christians in europe believed that palestine was the Holy Lands* and wanted to regain them from the Muslims. *Holy Lands=Place where Jesus supposedly lived, died, and preached.
The Holy Lands are important to both the Christians and Muslims. The crusades began when the Muslims began denying Christians access to the sacred sites.
regain the holy lands, unite the people in europe, and Convert non-Christians to Christianity.
Win control of the Holy Lands, the background to the Bible, and in particular the Holy City, Jerusalem itself. Medieval Christians saw it as a great sin to have such sacred places held by "heathens".
The Christians wanted the Holy Lands.
The Holy Bible is the sacred text for Christians.
The Crusades were about re-capturing the Holy Land, which is the sacred land for Christians.
The Holy Bible is from God. God love Christians and Christians love God.
The same sight that is also sacred (Holy) for the Jews and the Christians., especialy Masjid i Umar.
Crusades occurred mostly to regain the Holy Lands - The Kingdom of Jerusalem from the muslims.
The first crusade started because the Christians wanted to regain the holy land of Jerusalem from the Muslims.
Holy Land.