1. Unfiled Papers and Slips Belonging in Confederate Compiled Service Records. National Archieves Microfilm Publication Number: M347. Washington, D.C.: National Archives and Records Administration. I accessed this through Footnote.com, which shows: 1) Samuel Maddox, Pvt., I/42Va, captured 863/07/04 “Shade Gap.” Born Va., a conscript; 2) Samuel Maddox, Pvt., I/42Va, captured “Shade Gap,” 863/07/04 Born Va., a conscript, named 863/08/30 on a roll of POWs “desirous of entering the service of the U.S.”; and 3) Simon F. Maddox, F/42Va, born Va., captured Gettysburg, POW Ft. Delaware by 863/09/22 when transferred to 3d Md. Cav. and sent from Ft. Delaware.
2. Selected Records of the War Department Relating to Confederate Prisoners of War 1861-1865. Microfilm Publication M598. National Archives. War Department Collection of Confederate Records. Record Group 109, Washington, D.C. I accessed this source through Ancestry.com. That source gave me: a) S.F. Maddox, Pvt., 42Va., captured unspecificed date, but listed on U.S. POW roll of men from 42Va captured in 863/07 [Ancestry.com page 31532]; 2) S.F. Maddox, Cpl., E/42Va, captured Gettysburg, Pa., 863/07/03, received Ft. Delaware 863/07/06. Subsequently joined 3d Md. US Cav [Ancestry.com p. 29474].
The tricky thing about the identification above is that among the Unfiled Papers and Slips Belonging in Confederate Compiled Service Records. National Archieves Microfilm Publication Number: M347, I found information that I have concluded pertains to a Samuel F. Maddox, Pvt., I/42Va, who I had identified previously from other sources, especially wartime muster rolls of the 42nd Va. in the University of Virginia Library, and not to the Simon/Simeon Maddox who joined the 3d Md. Cav.:
What the wartime muster rolls told me was this:
MADDOX, SAMUEL F.: Pvt., Co. I. Enl. 3/5/62, Lynchburg. Present in unit 4/30/62. Sent sick to Staunton hospital 5/6/62. Remained absent from unit through 1/1/63. During absence was furloughed, sick leave, by 6/30/62; was at home, sick, by 11/1/62 and AWOL from unit, at home, by 1/1/63.
What I found in the Unfiled Slips, M347, was this: 1) Samuel F. Maddox, Pvt., I/42Va. POW Old Capitol Prison; hospitalized there, diarrhea, 11/13 to 23/64 when released back to prison; and 2) Sam’l F. Maddox, Pvt., I/42Va, hosp, intermittent fever, Old Capitol Prison, Wash., DC, 864/12/10 to 865/08/05 when released from hospital.
I will acknowledge that there is a slim possibility that the Samuel F. Maddox, 42nd Va., and Simon/Simeon Maddox who served in the 3d Md. Cav. could be the same man. For that to be true, however, the man who joined the 3d Md. Cav. would have to deserted back to his CS comrades and then been recaptured by US forces sometime between 22 Sep. 1863 and 11 Nov. 1864. Perhaps the CSR from the 3d Md. will shed sufficient light to confirm or reject such a possibility.