a series of actions advancing a principle or tending toward a particular end
"he supported populist campaigns"
"they worked in the cause of world peace"
"the team was ready for a drive toward the pennant"
"the movement to end slavery"
"contributed to the war effort"
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
"The history book detailed how King Richard I led a famous crusade to reclaim Jerusalem during the medieval period."
One of a series of religious campaigns by Christian forces from the 11th to the 13th century, mostly to capture the Holy Land from the Muslims who occupied it.
"The historian spent years researching the logistics of the Third Crusade, detailing how Richard the Lionheart led his forces through Anatolia and Syria."
Any of the military expeditions undertaken by the Christians of Europe in the 11th to 13th centuries to reconquer the Levant from the Muslims.
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"
go on a crusade; fight a holy war
"The knight vowed to lead his men on a final crusade to reclaim the holy city from invaders."
To go on a military crusade.
"The king led his army on a religious crusade to reclaim the holy lands from invaders."