Summarize British East India Company Official NAME_1's account of the mutiny of 1857, highlighting the key points about the contemporary background and causes of 1857 rebellion in British Colonial India, the timeline of rebellion, the objectives of rebels, organization structure and level of cooperation between rebelling forces, social background of rebelling ground forces, how the rebellion was suppressed, role of natives siding with the British East India Company, any atrocities from both sides, British reprisals, lessons learnt, any recommendation to the British etc.