For anyone who might be interested, here is the official report of the Battle of Inman Hollow, July 7 1862. Since I understand Stevenson's Mill was in the present park boundaries (it was later burned and relaxed), it sounds like Major Gallup led a detachment of the Third Missouri Cavalry right through the present park to the mouth of the hollow. Then they went northeast up the hollow for three miles where they fought the battle.
One thing thats a little disturbing is the lack of wounded. In a typical battle there's normally four or five wounded for every man killed. I have also run across a statement written a few months later from a soldier at nearby Salem saying that company Q of the Third Missouri Cavalry kept the guerrillas in the area in "wholesome terror," and "rarely take prisoners." (This is in Inside War by Michael Fellman, p. 77).
Company Q is not listed as one that actually fought in the battle, but this still leaves me wondering if some atrocities might have occurred. There was a lot of that sort of thing in Missouri in the war.
In any case, here's the official report and a link to the original source.
JULY 7, 1862.- Skirmish at Inman Hollow, Mo.
Report of Major Henry A. Gallup, Third Missouri Cavalry.
SIR: In pursuance of Special Orders, Numbers 21, from these headquarters, I took command of a detachment of 205 men of Companies B, D, G, and H, and proceeded to Crow's Station, arriving there at 1 a, m, on Sunday. The next morning I sent Company G, in charge of Sergeant Haines, with the wagons, direct to Salem, and proceeded with the other three companies to Stevenson's Mill, on the Current River, leaving a detachment of 15 men at Spring Creek, to reconnoiter and get such information as was to be obtained of the whereabouts of any rebel force that was in that vicinity. Monday morning, the 7th instant, I sent Lieutenant Avery back to Spring Creek with Company H, to go from that place to Salem, and proceeded down the river with the two remaining companies to the mouth of Inman Hollow.
Learning that several bands of rebels had been seen the night before about the head of this Hollow, and receiving information that there was a rebel camp, 200 strong, in that vicinity, I proceeded up the Hollow-searching closely for indications of an enemy. After proceeding about 3 miles 5 rebels were discovered getting corn from a barn on the road-side. Lieutenant Agnew, with the advance guard, drove them into the camp on the opposite side of the road, closely followed by Company B, Captain Glover commanding, charging the camp at full speed. The rebels fled precipitately, leaving coats, blankets, and arms on the ground. Owing to the distance at which they heard the firing from the house, they were flying in every direction when we arrived at their camp. We succeeded, however,, in killing 11, mortally wounding 1, and taking 1 prisoner, with several horses and mules. Their arms we were obliged to destroy, as we had no means of transportation. Two Hall's carbines, 1 German carbine, and 1 revolver pistol were saved. From Inman Hollow we marched to Salem, and encamped for the night.
On Tuesday morning I left Company H, with several horses of other companies, unable to travel for want of shoes, and proceeded direct to these headquarters, having directed Lieutenant Avery to proceed to this place on Wednesday following.
I am, colonel, your obedient servant,
H. A. GALLUP,
Major Third Missouri Cavalry.