The Royal Indian Navy mutiny was a failed insurrection of Indian naval ratings, soldiers, police personnel and civilians against the British government in India in February 1946. From the initial flashpoint in Bombay (now Mumbai), the revolt spread and found support throughout British India, from Karachi to Calcutta (now Kolkata), and ultimately came to involve over 10,000 sailors in 56 ships and shore establishments. The mutiny failed to turn into a revolution because sailors were asked to surrender after the British authorities had assembled superior forces to suppress the mutiny.