What event sparked the Great Rebellion of 1857?

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The rumor that cow and pig fat was used to grease the cartridges used in soldiers' rifles was the event that sparked the Great Rebellion of 1857. This rumor angered both Hindu and Muslim soldiers, as cows are sacred to Hindus and pigs are considered unclean in Islam. The soldiers refused to use the cartridges, leading to disciplinary action by the British, which further inflamed tensions and led to the rebellion.

What Event Sparked the Great Rebellion of 1857