I found on the US Prisoners of War Records, that Robert A. Paxton was sent to Alton Prison, Sept 29, 1864. It said he was with the 1st Missouri Cavalry, Co. F, Captured Aug 3, 1863 in McHenry Co., Mo.

And
Publication: Liberty Weekly Tribune
Place: Liberty, Missouri
Date: 1863 Aug 21
Page Number: 2

Lexington Items
From the Lexington Union.
The Notorious Snelling Killed.
Lieut. Co. James H. Brown, who commands the Post at Clinton, Henry county, Mo., writes to Col. Neil, of the 5th Provisional Reg., E.M.M., that he, a few days ago, captured the notorious bushwhacker Snelling, and executed him. It will be remembered that Snelling for many months was the terror of Johnson and Henry counties. He it was who captured and burned the wagon train, in Johnson county, and murdered the sick soldiers under escort to Kansas City, about twenty months ago.

BRAVE CHARLES SNELLING AND HIS FATE.
by r. b. coleman, m'allister, ind. ter.

"In Johnson County, Missouri, lived the most loyal of Southern people. At the breaking out of the war there lived about sixteen miles southeast of Warrensburg Charles Snelling, who was then assessor of the county. When Lyon went into the State Charles Snelllng raised a company of Southern boys and went to the front at Boonville. After Clabe Jackson fell back to Carthage Snelling was detailed as recruiting officer, and returned to Johnson County, where he raised another company and took the men south. He delivered them to "Pap" Price, at Cow Skin, returned again to his old home and raised another company, stayed in the county most of the winter of 1861, harassing the Federals and State Militia, capturing a good many prisoners, among them General Veach and staff. As Blount's army was marching along the road, General Veach and staff were riding between two regiments, when Captain Snelling, with Dr. David Warren, Dr. Henry Owsly, a brother of the writer and Dr. Roger Snelling, rode out of the bushes and captured General Veach, a Major Starr, I think, two captains and two orderlies, with a servant. They took them down on the creek and kept them all night near Dr. Hough's [Huff's] farm. When morning came they were paroled and sent hack to Sedalia where they started from. Captain Snelling then went south and delivered his company to the main army.

"In the spring of 1863 he was sent by General Price back to Missouri to recruit more troops, and had proceeded on his way as far as Grand River, in Henry County, where, in a desperate struggle he was captured and taken to Calhoun, in Henry County, by one Bill Weaver, who commanded, or rather followed, a lot of cut-throats called Home Guards. Captain Snelling was tried by a court-martial and convicted of being a "bushwhacker."

"He was taken to Clinton. the county seat of Henry County, his coffin was prepared, the grave dug, and he was placed on his coffin and taken to the grave, and there, within eighteen miles of his old widowed mother, was shot dead. When he was placed on his coffin a man commenced to bandage his eyes, when he said Don't do that; I'm not afraid to die like a brave man. Thus was enacted one of the blackest crimes in the annals of the war, as Captain Snelling was a regular commissioned officer of the Confederacy, and not a bushwhacker. but there had to be some excuse to murder helpless soldiers by men who were too cowardly to go to the front.