The Royal Indian Navy mutiny (also called the Royal Indian Revolt or Bombay Mutiny) encompasses a total strike and subsequent revolt by Indian sailors of the Royal Indian Navy on board ship and shore establishments at Bombay (Mumbai) harbour on 18 February 1946. From the initial flashpoint in Bombay, the revolt spread and found support throughout British India, from Karachi to Calcutta and ultimately came to involve 78 ships, 20 shore establishments and 20,000 sailors.