The decline and fall of the Mughal Empire in the mid-18th century contributed to the East India Company's accumulation of power in the region. In 1757, the Company defeated and killed the Mughal governor of Bengal, Sirajud-Dawla, after he captured Calcutta in an attempt to hinder the Company from depriving merchants and the government of revenue. By 1765, the Company had acquired control of the revenue systems of Bengal, Orissa, and Bihar, on India's east coast, and became the largest territorial power in India. The India Act of 1784 gave Parliament control of the company's affairs in London, but the heads of the Company oversaw the governance of India. Parliament transferred the Company's power over administration of the Indian territories to the Crown in 1858 after the Great Rebellion of 1857 , an uprising of Indian soldiers (sepoys) that was largely blamed on the Company's mismanagement of the territory.