Fort Donelson Union order of battle
Division Brigade Regiments and Others
First Division BG John A. McClernand 1st Brigade K -184 , W -603 , M -66 = 853 Col Richard J. Oglesby 8th Illinois : Ltc Frank L. Rhoads 18th Illinois : Col Michael K. Lawler ( w ) , Cpt Daniel H. Brush ( w ) , Cpt Samuel B . Marks 29th Illinois : Col James S. Reardon 30th Illinois : Ltc Elias S. Dennis 31st Illinois : Col John A. Logan ( w ) , Cpt Jasper M. Dresser Battery D , 1st Illinois Light Artillery : Cpt Thomas Larrison 2nd Illinois Cavalry , Companies A & B : Maj John J. Mudd ( w ) , Cpt John Hotaling 2nd U.S. Cavalry , Company C ; 4th U.S. Cavalry , Company I : Lt James Powell Carmichael 's Illinois Cavalry Company : Cpt Eagleton Carmichael Dollins ' Illinois Cavalry Company : Cpt James Dollins O'Hartnett 's Illinois Cavalry Company : Cpt M. J. O'Harnett Stewart 's Illinois Cavalry Company : Lt Ezra King
First Division BG John A. McClernand 2nd Brigade K -99 , W -350 , M -98 = 547 Col William H. L. Wallace 11th Illinois : Ltc Thomas E. G. Ransom ( w ) , Maj Garnett Nevin 20th Illinois : Col C. Carroll Marsh 45th Illinois : Col John Eugene Smith 48th Illinois : Col Isham N. Haynie , Ltc Thomas H. Smith ( k ) Battery B , 1st Illinois Light Artillery : Cpt Ezra Taylor Battery D , 1st Illinois Light Artillery : Cpt Edward McAllister 4th Illinois Cavalry : Col Theophilus Lyle Dickey
First Division BG John A. McClernand 3rd Brigade K -28 , W -105 , M -19 = 152 Col William R. Morrison ( w ) Col Isham N. Haynie Col Leonard F. Ross 17th Illinois : Col Leonard F. Ross , Maj Francis M. Smith , Cpt Henry H. Bush 49th Illinois : Ltc Phineas Pease Battery H , 1st Missouri Light Artillery : Cpt Frederick Welker Battery K , 1st Missouri Light Artillery : Cpt George H. Stone
Second Division BG Charles F. Smith 1st Brigade K -69 , W -340 , M -20 = 429 Col John McArthur 9th Illinois : Ltc Jesse J. Phillips 12th Illinois : Ltc Augustus L. Chetlain 41st Illinois : Col Isaac C. Pugh
Second Division BG Charles F. Smith 3rd Brigade K -10 , W -109 , M -2 = 121 Col John Cook 7th Illinois : Ltc Andrew J. Babcock 50th Illinois : Col Moses M. Bane 52nd Illinois : Col Thomas W. Sweeny 12th Iowa : Col Joseph J . Wood 52nd Indiana : Col James M. Smith 13th Missouri : Col Crafts J. Wright Battery D , 1st Missouri Light Artillery : Cpt Henry Richardson
Second Division BG Charles F. Smith 4th Brigade K -55 , W -301 , M -1 = 357 Col Jacob G. Lauman 2nd Iowa : Col James Tuttle 7th Iowa : Ltc James Parrott 14th Iowa : Col William T. Shaw 25th Indiana : Col James C. Veatch Birge 's Western Sharpshooters : Col John W. Birge
Second Division BG Charles F. Smith 5th Brigade K -11 , W -69 , M -0 = 80 Col Morgan L. Smith 11th Indiana : Col George F. McGinnis 8th Missouri : Maj John McDonald
Third Division BG Lew Wallace 1st Brigade K -35 , W -182 , M -16 = 233 Col Charles Cruft 31st Indiana : Ltc John Osborn , Maj Fred Arn 44th Indiana : Col Hugh B. Reed 17th Kentucky : Col John H. McHenry , Jr. 25th Kentucky : Col James M. Shackelford
Third Division BG Lew Wallace 2nd Brigade K 6 , W -15 , M -1 = 22 46th Illinois : Col John A. Davis 57th Illinois : Col Silas D. Baldwin 58th Illinois : Col William F. Lynch 20th Ohio : Col Charles Whittlesey
Third Division BG Lew Wallace 3rd Brigade K -3 , W -24 , M -1 = 28 Col John M. Thayer 1st Nebraska : Ltc William McCord 58th Ohio : Ltc Ferdinand F. Rempel 68th Ohio : Col Samuel H. Steedman 76th Ohio : Col William B . Woods
Third Division BG Lew Wallace Unattached K -0 , W -20 , M -0 = 20 Battery A , 1st Illinois Light Artillery : Lt Peter P. Wood 32nd Illinois , Company A : Cpt Henry Davidson
Union Forces -- District of Cairo
BG Ulysses S. Grant , Commanding Chief of Staff : Col Joseph D. Webster Chief of Engineers : Col James B. McPherson Assistant Adjutant General : Cpt John A. Rawlins
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.