Elizabeth II was at war with herself, briefly.

Jamaica has the monarchy. Jamaican forces were part of the US-led coalition that invaded Grenada in 1983, after the communists seized power. The communists found it politically expedient to maintain the structure of parliamentary government, and so the head of state of Grenada also remained nominally, Elizabeth II.

One wonders what to do, when's One's subjects are wont to misbehave so?