The Battle of Grand Gulf was fought on April 29, 1863, during th: Several varieties of English are also spoken in the Caribbean islands that were colonial possessions of Britain, including Jamaica, the Leeward and Windward Islands and Trinidad and Tobago, Barbados, the Cayman Islands and Belize. Each of these areas is home both to a local variety of English and a local English-based creole, combining English and African languages. The most prominent varieties are Jamaican English and Jamaican Creole. In Central America, English-based creoles are spoken on the Caribbean coasts of Nicaragua and Panama.[305] Locals are often fluent in both the local English variety and the local creole languages, and code-switching between them is frequent. Indeed, a way to conceptualise the relationship between such creole and standard varieties is to view them as a spectrum of language registers in which the most creole-like forms serve as the "basilect" and the most RP-like forms serve as the "acrolect", the most formal register.[306]