(Sioux name Pizi) (1840–94), Hunkpapa Sioux Indian leader. He was born in about 1840 on the Moreau River in what is now South Dakota. As a young man he became a noted warrior and later allied himself with his tribe's political leader, Sitting Bull, and acted as his military lieutenant. Gall was a leader in the battle of the Little Bighorn (1876), but he later cooperated with the government. After 1889 he was judge of the Court of Indian Offenses at Standing Rock Agency in South Dakota.