each of a series of medieval military expeditions made by Europeans to the Holy Land in the 11th, 12th, and 13th centuries

the fanaticism engendered by the Crusades

in 1204 the armies of the Fourth Crusade sacked Constantinople

a vigorous campaign for political, social, or religious change

a crusade against crime

a crusade to improve education and training

critics have questioned the effectiveness of his anti-corruption crusade

lead or take part in a vigorous campaign for social, political, or religious change

they crusaded against gambling in the 1950s

he crusaded for civil rights his entire life