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AnimeBrainly
A crusade is a church sponsored military activity that asked europeans to go and liberate Jerusalem from the Muslims.

hope this helps

Note* only the 1st crusade was successful, the rest, even if they did get their objective, technically failed
mustafaahi6otazbl
The general term of a crusade is that of war based upon the pretense of a religious war. It is used to described the Christian crusades against Islam to retake Jerusalem.