The Battle of Grand Gulf was fought on April 29, 1863, during th: Estimates of the numbers of second language and foreign-language English speakers vary greatly from 470 million to more than 1 billion, depending on how proficiency is defined.[9] Linguist David Crystal estimates that non-native speakers now outnumber native speakers by a ratio of 3 to 1.[80] In Kachru's three-circles model, the "outer circle" countries are countries such as the Philippines,[81] Jamaica,[82] India, Pakistan, Singapore,[83] Malaysia and Nigeria[84][85] with a much smaller proportion of native speakers of English but much use of English as a second language for education, government, or domestic business, and its routine use for school instruction and official interactions with the government.[86]