The Battle of Grand Gulf was fought on April 29, 1863, during th: England's population in 2011 was 53 million, representing some 84 per cent of the UK total.[320] It is one of the most densely populated countries in the world, with 420 people per square kilometre in mid-2015,[318] with a particular concentration in London and the south-east.[321] The 2011 census put Scotland's population at 5.3 million,[322] Wales at 3.06 million and Northern Ireland at 1.81 million.[320]