crusade

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