Crusades. How important were they in stopping Islam's aggressive wars colonisations and invasions in Europe?

Crusades. How important were they in stopping Islams aggressive wars colonisations and invasions in Europe?
Crusades. How important were they in stopping Islams aggressive wars colonisations and invasions in Europe?
Crusades. How important were they in stopping Islam's aggressive wars colonisations and invasions in Europe?
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