Battle of Egypt Station MS, December 28, 1864
See: http://breckinridgegreys.org/galvanized2.html

I did a quick scan, but did not see a reference to colors.

Order of Battle – Egypt Station MS, Dec. 28, 1864

Union Forces: Grierson's Cavalry Division – Brig. Gen. Ben. Grierson44
Provost Guard & Escort – Co. F, 2nd Iowa Cavalry (40)
Pioneers – Lt. Lewis (50 negroes)
1st Brigade – Col. Joseph Kargé (1101)
2nd New Jersey Cavalry – Lt. Col. P. Jones Yorke
7th Indiana Cavalry – Capt. J. H. Elliott
4th Missouri Cavalry – Capt. Hencke
1st Mississippi Rifles (in the rear & not engaged)
2nd Brigade – Col. E. F. Winslow (825) (not engaged)
3rd Iowa Cavalry – Col. John W. Noble
4th Iowa Cavalry
10th Missouri Cavalry
3rd Brigade – Col. E. D. Osband (1726)
2nd Wisconsin Cavalry (detached & not engaged)
4th Illinois Cavalry – Capt. A. T. Search
11th Illinois Cavalry – Lt. Col. Otto Funke
3rd US Colored Cavalry (deployed late in the battle)
Union Strength: 2100-2500 engaged

Confederate Forces:46
Wier's Command – Lt. Col. William W. Wier
O'Neill's Regiment – Lt. Col. Michael Burke (500)
Metts' Battalion (1st Miss. Cav. Reserves) – Lt. Col. David W. Metts47 (200; dism.)
Clark Missouri Battery – Capt. Houston King
1st Confederate Veterans Infantry – Lt. Col. William W. Wier (500)
Cavalry – Brig. Gen. S. J. Gholson (250)
Not a brigade, but a camp of dispersed cavalry collected to be returned to the front.
A few horsemen under Capt. J. C. Shoup reported to Wier at the end of the battle.
Confederate Strength: About 1500