Henery Oscar One Bull (Lakota: Tȟatȟáŋka Waŋžíla in Standard Lakota Orthography) (circa 1853-1947) was a LakotaSioux man best known for being the nephew and adopted son of the great holy man, Sitting Bull. He was also the younger brother of White Bull, a famous Lakota warrior and chief contributor to Stanley Vestal's biography of their uncle. He wore his Uncle's shield during the Battle of Little Bighorn. One Bull joined his uncle in fleeing to Canada following the Battle of the Little Bighorn in 1876. Sitting Bull's band remained in the "Grandmother's Country" until he surrendered in North Dakota in 1881. One Bull stood by Sitting Bull at his surrender.