Is this the skirmish? Capt. Kehoe did not report any casualties in this report.

I checked the 2600 man roster found in the American Civil War Research Database, no joy

.....

AUGUST 18, 1864.--Skirmish at Benton, Ark.

Report of Capt. Miles Kehoe, First Missouri Cavalry.

HDQRS. DETACHMENT THIRD BRIGADE, FIRST DIVISION,
Benton, Ark., August 18, 1864.

SIR: I have the honor to report that on my arrival at Benton at 4.30 this
p. m. I was fired on by a detachment of rebels, numbering about 100,
which immediately retreated across the Saline. I succeeded in capturing
1 wounded man, who reported to me that a brigade of cavalry who
occupied Benton had left two hours previous to my arrival, owing to
information they had gained from a woman who had ridden to this place
from Little Rock ahead of me, and also he reported to me that the rebel
army was all about to move toward Little Rock. I have heard from
reliable source that there is a large force to move in the direction of
Monticello and Pine Bluff. The prisoner reports to me that there are two
brigades of cavalry on the other side of the Saline from here, under
command of Col. Crawford, which were expected to cross the Saline
to-morrow. My intention is to cross the Saline on his left flank in the
direction of Hot Springs in the morning. I have fallen back two miles
from Benton to a good position for the purpose of feeding my horses.
You order will reach me on the road in the direction of Princeton. I
shall cross the Saline to-morrow, and if possible ascertain the position
of the main force of the enemy.

I have the honor to remain, very respectfully, your obedient servant,

M. KEHOE,
Capt., Cmdg. Detach. Third Brig., First Div., 7th Army Corps.

Source: Official Records
CHAP. LIII.] SCOUT ON THE REPUBLICAN RIVER, KANS. PAGE 265-83
[Series I. Vol. 41. Part I, Reports. Serial No. 83.]

……….

Captain Alexander Mills, Company E, reported at the JulyAug, 1864 muster as absent, on furlough since August 14, 1864