Here's the Order of Battle.

George Martin

BUCKHORN ARKANSAS
25 May 1864

{Shelby’s Operations North of the Arkansas River}
OR-Series I, Volume XXXIV, Chapter XLVI, Pg 928

Union Forces
Williams’ Command --- Bill Williams

Confederate Forces
Advance of Shelby’s Brigade --- Captain D. A. Williams

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O.R.-- SERIES I--VOLUME XXXIV/1 [S# 61]

MAY 13-31, 1864.--Shelby's operations north of the Arkansas River.

No. 1.--Reports of Brig. Gen. Joseph O. Shelby, C. S. Army, including operations May 5-June 27.

[Excerpt]

Being satisfied that great numbers of men were at home in the mountains beyond the Arkansas--men who were deserters, yet pardoned by President Davis' proclamation--I gave Colonels Jackman and Coffee authority to raise one or more regiments, besides recruiting powers to fifty or more captains for companies, and hastened on to White River, knowing a large force would be sent up from Little Rock to intercept me in the mountain gorges of the Ozark. The Federals at Clarksville left in dismay, and the wave of terror spread even unto Yellville and Forsyth. On through Dover and Clinton, over rough and sterile roads, over the Blue and Ozark Mountains, through Richwoods and Buck Horn, I hastened forward. At the latter place the notorious Bill Williams, who commands a company of hybrid deserters, negroes, women-ravishers, and Federals, was encountered by Capt. D. A. Williams, of my advance, charged, routed, scattered, and 47 killed, 2 captured, who were shot next day. Young girls and old women met us the next day and called down Heavens blessing on my command for what they termed a glorious and a righteous deed.