There were a wide range of factors causing apprehension and mistrust in the Bengal Army immediately prior to the Barrackpore event. Pandey's reference to cartridges is usually attributed to a new type of bullet cartridge used in the Enfield P-53 rifle which was to be introduced in the Bengal Army that year. The cartridge was thought to be greased with animal fat, primarily from cows and pigs, which could not be consumed by Hindus and Muslims respectively (the former a holy animal of the Hindus and the latter being abhorrent to Muslims). The cartridges had to be bitten at one end before use. The Indian troops in some regiments were of the opinion that this was an intentional act of the British, with the aim of defiling their religions.