The immediate event that angered the sepoy was the ammunition for the new Enfield rifles, which they had to use. The cartridges that were used in the new rifles had to be bitten open. The Muslims were angry because they thought that the paper cartridges had pig fat in them. Hindu soldiers were angry because they believed the cartridges had cow fat in them. On January 27, Colonel Richard Birch ordered that no cartridges should have grease on them and that sepoy could grease them with whatever they wanted.
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