Answer:
The introduction of Greased cartridges in 1856 sparked the fire. The government decided to replace the old-fashioned musket, `Brown Begs` by the `Enfield rifle,. The loading process of the Enfield rifle involved bringing the cartridge to the mouth and biting of the top paper. There was a rumour among the Sepoys in January 1857 that the greased cartridge contained the fat of cow and pig, the former sacred to Hindus and latter forbidden to Muslims. The Sepoys were now convinced that the introduction of greased cartridges was a deliberate attempt to defile Hindu and Muslim religion. This sparked off the Mutiny on 29th March 1857.