They weren’t all battles and bloodshed. There was also coexistence, political compromise, trade, scientific exchange—even love. MISSY SULLIVAN UPDATED: SEP 3, 2018 It’s often said that winners dictate history. Not so for the medieval holy wars called the Crusades. Muslim forces ultimately expelled the European Christians who invaded the eastern Mediterranean repeatedly in the 12th and 13th centuries—and thwarted their effort to regain control of sacred Holy Land sites such as Jerusalem.