crusade - noun

a series of actions advancing a principle or tending toward a particular end

any of the more or less continuous military expeditions in the 11th to 13th centuries when Christian powers of Europe tried to recapture the Holy Land from the Muslims

crusade - verb

• exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for
• go on a crusade; fight a holy war

crusade - thesaurus

agitate   campaign   cause   drive   effort   fight   movement   press   push