The Rebellion of 1857, also known as the Sepoy Mutiny, was a widespread uprising against the British that was suppressed by late 1858. It produced fierce battles at Delhi, Kanpur, and Lucknow, and involved leaders such as Nana Sahib, Tantia Tope, and Lakshmi Bai. Its defeat ended the Mughal dynasty and transferred governing authority from the East India Company to the British crown, marking the start of the British raj.