I couldn't find that unit either. I looked in my book of Georgia units and did find him in a later unit. The 12 regiments of the Georgia Militia were turned over to the CSA during the Sherman campaign. The State of Georgia had to reorganised the militia and those records are harder to come by. Most of this information is in my book but not in this form. Since the book was printed I've done a little more work on the re-organized militia. Hope this helps you.

Georgia Militia Battalion of Spalding County
Major A. D. Nunnally Spalding County

Spalding County Georgia Militia, 1ST Company
Capt. John Beasley Spalding County

Spalding County Georgia Militia, 2ND Company
Capt. L. S. Moore Spalding County
1ST Lieut. Carp ?
2ND Lieut. William D. Tankersly

Spalding County Georgia Militia, 4TH Company
Capt. James Aiken Spalding County
1ST Lieut. C. C. Green
2ND Lieut. J. C. Nunnally
3RD Lieut. A. M. Lester

Spalding County Local Defense Company, Police
Capt. P. H. Sanson Spalding County
Capt. P. A. Lawson
1ST Lieut. J. D. Stewart

Spalding County Local Defense Company, Police
Capt. F. D. Dismukes Spalding County
1ST Lieut. W. H. Pennele

This battalion along with the Georgia Militia Battalions of Fayette and Butts Counties were referred to as the 26TH Military District Georgia Militia.

.