Look at George Watkins website (link below) regarding the 12th GA Lt Artillery Battalion.
I had 3 Great Uncles in the unit, one (George Stallings) perished at Monocacy, one (DB Stallings)
prevented from re-joining due to Sherman's March to the sea, and the last (Robert R Stallings)
surrendered at appomattox.
I spoke to George Watkins several years ago, and I know he's done extensive research on 12th GA Lt Artillery Bat.