they were wars fought against Islamic oppression in the middle east. Specifically in the Holy Land. The Ottoman Turks had taken over that area of the world, and were pillaging towns and oppressing all the people of the area. So monarchs around Europe came together under the banner of the Catholic Church, and fought against those evils. Unfortunately, as a result of the Black legend, and some atrocities committed by those monarchs such as the Sack of Constantinople, many people wrongfully attempt to smear the name of the Catholic Church using the Crusades as an excuse for the slander. When in fact that Catholic Church as a religion, did no wrong.