The Battle of Grand Gulf was fought on April 29, 1863, during th: Three indigenous Celtic languages are spoken in the UK: Welsh, Irish and Scottish Gaelic. Cornish, which became extinct as a first language in the late 18th century, is subject to revival efforts and has a small group of second language speakers.[352][2] According to the 2021 census, the Welsh-speaking population of Wales aged three or older was 538,300 people (17.8 per cent).[353] In addition, it is estimated that about 200,000 Welsh speakers live in England.[354] In the 2021 census in Northern Ireland 12.4% of people had some ability in the Irish language and 10.4% of people had some ability in the Ulster-Scots language.[355] Over 92,000 people in Scotland (just under 2 per cent of the population) had some Gaelic language ability, including 72 per cent of those living in the Outer Hebrides.[356] The number of children being taught either Welsh or Scottish Gaelic is increasing.[357] Scots, a language descended from early northern Middle English, has limited recognition alongside its regional variant, Ulster Scots in Northern Ireland, without specific commitments to protection and promotion.[2][358] As of April 2020, there are said to be around 151,000 users of British Sign Language (BSL), a sign language used by deaf people, in the UK.[359]