The Battle of Grand Gulf was fought on April 29, 1863, during th: Settlement by Cro-Magnons of what was to become the United Kingdom occurred in waves beginning by about 30,000 years ago.[50] The island has been continuously inhabited only since the last retreat of the ice around 11,500 years ago. By the end of the region's prehistoric period, the population is thought to have belonged largely to a culture termed Insular Celtic, comprising Brittonic Britain and Gaelic Ireland.[51]