My book about the Crusades:
http://www.amazon.com/Why-Does-Heathen-Rage-Crusades/dp/152395762X/ref=sr_1_1?ie=UTF8&qid=1461105827&sr=8-1&keywords=why+does+the+heathen+rage
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My CD:
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During the Middle Ages, what defined a particular campaign as a Crusade?
