WHY AND HOW did India rise up against the British Empire?

Due to the Naval Mutiny, Britain decided to leave India in a hurry because they were afraid that if the mutiny spread to the army and police, there would be large scale killing of Britishers all over India. Hence Britain decided to transfer power at the earliest. The British signed treaties and made military and trading alliances with many of the independent states that made up India. The British were very effective at infiltrating these states and gradually taking control. They often left the local princes in charge of the various parts of India.