The Manhattan Rebellion was a failed coup attempt by officers of the Royal Thai Navy against the government of Prime Minister Plaek Pibulsonggram (Phibun) on 29–30 June 1951. They took the prime minister hostage during a handing over ceremony for the US dredge boat Manhattan and brought him aboard the Navy's flagship HTMS Sri Ayudhya. However, they were met by the combined forces of the Royal Thai Army, Air Force and Police. Heavy fighting ensued, and Sri Ayudhya was sunk despite Phibun being on board. The prime minister had to swim ashore along with the ship's crew. The event led to the Navy being stripped of most of its power and influence. It also showed that political power actually lay with commanders of the Armed Forces rather than the prime minister.