1964, The Dar Mutiny. The two battalions of the Tanganyika Rifles (virtually the entirety of newly founded Tanzanian Army)mutinied, detaining a number of the British contract officers on strength. A Royal Marine battalion was landed by choppers and crushed the revolt. Allegedly, due to a monumental fuck up, only blank and practice ammo was issued. The Royals commandeered some civvy vehicles and lobbed a practice round from a 3.5” rocket launcher into the garrison guardhouse, which dislodged a few tiles and panicked the mutineers into surrender. Actually there was a bit more fighting than that.
Busy year for Britain, Aden and Borneo aside. There was another British intervention in Kenya the same year over a pay mutiny and Britain almost and should have intervened in Zanzibar where a terrible massacre of the Arab population took place.