Battle of Mill Springs order of battle: Union explained

The following Union Army units and commanders fought in the Battle of Mill Springs during the American Civil War on January 19, 1862, near present-day Nancy, Kentucky. The Confederate order of battle is listed separately.

Abbreviations used

width=25%	Brigade	Regiments and Other
Second Brigade Col Mahlon Dickerson Manson	10th Indiana: Ltc William C. Kise 4th Kentucky Infantry: Col Speed Smith Fry (w) 14th Ohio Infantry, Company C: Cpt J. W. Brown
Third Brigade Col Robert Latimer McCook (w)	2nd Minnesota Infantry (9 companies): Col Horatio Phillips Van Cleve 9th Ohio Infantry: Maj Gustave Kammerling
Twelfth Brigade Col Samuel Perry Carter	12th Kentucky Infantry: Col William A. Hoskins 1st Tennessee Infantry: Col Robert K. Byrd 2nd Tennessee Infantry: Col James P. T. Carter 1st Kentucky Cavalry (4 companies): Col Frank Lane Wolford
Artillery	Battery B, 1st Ohio Artillery: Cpt William E. Standart Battery C, 1st Ohio Artillery: Cpt Dennis Kenny Jr. 9th Ohio Battery: Cpt Henry Shepard Wetmore

10th Kentucky Infantry: Col John Marshall Harlan
2nd Minnesota Infantry, Company A: Cpt Judson Bishop (on picket duty; engaged in pursuit to Beech Grove)
17th Ohio Infantry: Col John M. Connell
35th Ohio Infantry: Col Ferdinand Van Derveer
38th Ohio Infantry, Company A: Cpt Charles Greenwood (camp guard; engaged in pursuit to Beech Grove)
1st Michigan Engineers & Mechanics, Companies D, F, G: Ltc K. A. Hunton (camp guard)

Battle, J. H., et al. Kentucky: A History of the State (Louisville, KY: F. A. Battey, 1885).
The Official Records of the War of the Rebellion, Ser. I, Vol. 7, pp. 79–116; 824.
Ohio Roster Commission. Official Roster of the Soldiers of the State of Ohio in the War on the Rebellion, 1861 - 1865, Compiled Under the Direction of the Roster Commission 12 vol. (Akron, OH: Werner Co.), 1886–1895.
Reid, Whitelaw. Ohio in the War: Her Statesmen, Her Generals, and Soldiers. (Cincinnati, OH: Moore, Wilstach, & Baldwin), 1868.