I've not been able to find any other information on this soldier. There are no muster rolls for Lumpkin's Battery in the records.
W. C. Miller
Enlisted as a Private
"Lumpkin's" Co. GA Lumpkin's Light Artillery
Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records
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W. C. Miller, Private, Captain Lumpkin’s Company, Georgia Artillery, captured at Athen’s Georgia,* no other records
* Paroled by command of Bvt. Brig. Genl. W. J. Palmer at Athens, Ga., on or about May 8, 1865
M266: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Georgia
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Lumpkin's Battery, Georgia Light Artillery
Capt. Edward P. Lumpkin
This battery served in Young's Battalion Artillery, Palmer's Battalion Reserve Artillery, and was paroled as part of Kemper's Battalion on 26 April 1865 in Athens, Georgia