Blue Horse was a real American Indian. He was an Oglala Lakota, who lived from 1822-July 16, 1908. He had a twin brother named Big Mouth. Blue Horse was one of the first Oglala Lakota United States Army Indian Scouts and one of the signers of the Treaty of Fort Laramie in 1868. He was also know for rescuing whites in distress and who needed help. He wrote a letter to President Grant that was published in a newspaper. He also joined Buffalo Bill's Wild West Show.