Believe this is the document you’re referring to. Unfortunately, i am unaware of service
records for Militia soldiers

John S Lane
Georgia, Civil War Muster Rolls, 1860-1864

Militia Report Of Captains

https://search.ancestry.com/cgi-bin/sse.dll?_phsrc=XbQ158&_phstart=successSource&usePUBJs=true&indiv=1&db=gacivilwarmusterrolls&gsfn=John%20Shackelford&gsln=Lane&msypn__ftp=heard,%20georgia,%20usa&msypn=1335&msbdy=1840&msidy=1863&new=1&rank=1&uidh=mfz&redir=false&msT=1&gss=angs-d&pcat=39&fh=0&h=53647&recoff=&ml_rpos=1