* Historical context: "The Crusades were a series of religious wars launched by European Christians against Muslims in the 11th to 13th centuries."
* Metaphorical usage: "The environmentalist group is on a crusade to protect endangered species."
* Emphasis on strong action: "The candidate launched a crusade against corruption in the government."
* Referring to a specific crusade: "The First Crusade was launched in 1095 and resulted in the capture of Jerusalem."
Remember to choose the sentence structure that best fits your intended meaning and context.