Sitting Bull was born into the Hunkpapa Lakota division of the Tenton Sioux in 1831 in Grand River, South Dakota. When he was 14 he joined his first war party. A war party is a group of people, usually Native Americans, engaged in fighting or attacking an enemy. He soon gained a reputation for his bravery during battle. Sitting Bull was a tribal leader and the Sioux chief. He helped expand the Sioux hunting grounds