Fort Donelson United States of America Order of Battle

First Division (Brigadier General John A. McClernand)
1st Brigade (Oglesby) 8th, 18th, 29th, 30th, 31st Illinois Infantry Battery D, E,  2d Illinois Light Artillery Companies A, B, 2d Illinois Cavalry Company C, 2d US Cavalry Company I, 4th US Cavalry Carmichael's Illinois Cavalry O'Harnett's Illinois Cavalry Stewart's Illinois Cavalry	2d Brigade (W.H.L. Wallace) 11th, 20th, 45th, 48th Illinois Infantry Battery B, D, 1st Illinois Light Artillery 4th Illinois Cavalry 3d Brigade (Morrison passed to W.H.L. Wallace) 17th, 49th Illinois Infantry

Second Division (Brigadier General Charles F. Smith)
1st Brigade (McArthur) 9th, 12th, 41st Illinois Infantry 3d Brigade (Lauman) 25th Indiana Infantry 2d, 7th, 14th Iowa Infantry Birge's Western Sharpshooters	2d brigade (Cook) Batteries D, H, K Missouri Light Artillery 7th, 50th Illinois Infantry 12th Iowa Infantry 13th Missouri Infantry 4th Brigade (M.L. Smith) 8th Missouri Infantry 11th Indiana Infantry

Third Division (Brigadier General L. Wallace)
1st Brigade (Cruft) 31st, 44th Indiana Infantry 17th, 25th Kentucky Infantry 3d Brigade (Thayer) 1 st Nebraska Infantry 58th, 68th, 76th Ohio Infantry	2d Brigade (attached to 3d Brigade) 46th, 57th, 58th Illinois Infantry Not Brigaded Company A, 32nd Illinois Infantry Battery A, 1st Illinois (Chicago Light Artillery)