The Battle of Grand Gulf was fought on April 29, 1863, during th: Varieties of English vary the most in pronunciation of vowels. The best-known national varieties used as standards for education in non-English-speaking countries are British (BrE) and American (AmE). Countries such as Canada, Australia, Ireland, New Zealand and South Africa have their own standard varieties which are less often used as standards for education internationally. Some differences between the various dialects are shown in the table "Varieties of Standard English and their features".[166]