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The Crusades where the Army/Marines of the middle age. Everyone wanted to be able to say they where either apart of them of that they where going to be one day. Everyone wanted to defend the religion that they grew up in, because of the way religion was in the middle ages people wanted to protect the way of life they had. At the time the crusades where around the Catholic religion was just starting to have to defend against the Islamic and Muslim people who where trying to over take the Catholic's, so it was the perfect time to have an army to be able to fight with.