 In 1763 he briefly acted as the interim military Governor of West Florida.By the summer of 1776, Prévost, then a colonel, was in charge of a contingent of the 60th stationed in St. Augustine, the capital of British East Florida.In the winter of 1778, following a proposal of Lord George Germain, Prévost, now a brigadier-general, was given orders by General Sir Henry Clinton to invade Georgia.