Fort Donelson Union order of battle

The following Union Army units and commanders fought in the Battle of Fort Donelson of the American Civil War. Order of battle compiled from the casualty returns, and the reports. The Confederate order of battle is listed separately.
Union Forces.
District of Cairo.
BG Ulysses S. Grant, Commanding
Western Flotilla.
Flag Officer Andrew H. Foote (w)
Rear Guard.
These units were attached to the District of Cairo but were posted to guard duty and did not take part in the campaign against Fort Donelson.