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The immediate cause of the Indian Revolt of 1857, or Sepoy Mutiny, was a seemingly minor change in the weapons used by the British East India Company's troops. The Company had upgraded to the new Pattern 1853 Enfield rifle, which used greased paper cartridges. In order to open the cartridges and load the rifles, soldiers (known as sepoys) had to bite into the paper and tear it with their teeth.

Rumors began to spread in 1856 that the grease on the cartridges was made from a mixture of beef tallow and pork lard. Eating cows, of course, is forbidden by Hinduism, while consumption of pork is forbidden by Islam. Thus, by making one small change to its munitions, the British managed to greatly offend both Hindu and Muslim soldiers.

The sepoys' revolt began in Meerut, the first area to receive the new weapons. British manufacturers soon changed the cartridges in an attempt to calm the spreading anger among the soldiers, but this move backfired. The switch only confirmed, in the minds of the sepoys, that the original cartridges had indeed been greased with cow and pig fat.
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so write it like- || The sepoys revolted against the British because when the rifles upgraded, which used greased paper cartridges , everything was fine till then but in 1856 rumors started to spread that the grease cartridges were made from a mixture beef tallow and pork lard. These rumors enraged the Hindus and islam because beef is forbidden in hindu and pork in Islam. That's the reason sepoys revolted against British ||