Question

what were the military reason of the revolt of 1857​

Answer 1

because British government had take all the rights of Indian peoples

Answer 2

The sepoys, a generic term was used for native Indian soldiers of the Bengal army. The spark that led to a mutiny in several sepoy companies was the issue of new gunpowder cartridges for the Enfield rifle in February, 1857. A rumour was spread that the cartridges were made from cow and pig fat.