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
go on a crusade; fight a holy war
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; "The liberal party pushed for reforms"; "She is crusading for women's rights"; "The Dean is pushing for his favorite candidate"
be the successor (of); "Carter followed Ford"; "Will Charles succeed to the throne?"
attain success or reach a desired goal; "The enterprise succeeded"; "We succeeded in getting tickets to the show"; "she struggled to overcome her handicap and won"