The Battle of Grand Gulf was fought on April 29, 1863, during th: Many users of English in the expanding circle use it to communicate with other people from the expanding circle, so that interaction with native speakers of English plays no part in their decision to use the language.[90] Non-native varieties of English are widely used for international communication, and speakers of one such variety often encounter features of other varieties.[91] Very often today a conversation in English anywhere in the world may include no native speakers of English at all, even while including speakers from several different countries. This is particularly true of the shared vocabulary of mathematics and the sciences.[92]