The Indian Congress occurred from August 4 to October 31, 1898 in Omaha, Nebraska, in conjunction with the Trans-Mississippi International Exposition. Occurring within a decade of the end of the Indian Wars, the Indian Congress was the largest gathering of American Indian tribes of its kind to that date. Over 500 members of 35 different tribes attended, including the Apache medicine man Geronimo, who was being held at Fort Sill as a United States prisoner of war.