Des Moines traces its origins to May 1843, when Captain James Allen supervised the construction of a fort on the site where the Des Moines and Raccoon Rivers merge. Allen wanted to use the name Fort Raccoon; however, the U.S. War Department preferred Fort Des Moines. The fort was built to control the Sauk and Meskwaki tribes, whom the government had moved to the area from their traditional lands in eastern Iowa. The fort was abandoned in 1846 after the Sauk and Meskwaki were removed from the state and shifted to the Indian Territory.