On the end notes for the 10th Georgia Battalion on page 290 it said this.
"Estes. Field Officers, "Regts," p. 20. This unit was also known as the 3rd Ga Bn.
Maybe Mr.Sibley was wrong, which now makes me wonder what else is wrong in the book.
I found this doing a google search on the history of the 10th Georgia Battalion
"The 10th Battalion was organized at Griffin, Ga, March 17, 1862, of companies mainly from Macon, Worth, Sumter and Bibb Counties. There were also men from counties surrounding each of the aforementioned counties. A 5th company was formed in July '62. In 1862, the Battalion guarded prisoners held at Camp Oglethorpe in Macon from May to December. They also guarded military installations within the city of Macon. They were sent to Virginia in December 1862 and attached to G.T. Anderson's Brigade through April '63. They did not guard any prisoners other than those at Macon. They participated in the Suffolk Campaign of Apr '63 and were later unattached from any brigade and posted at Franklin, Va, for 8 months from August '63 to Apr '64. They did not serve in N. Carolina except for patrols from Franklin. In April '64, the Battalion was attached to A.R. Wright's Brigade and participated in the campaign from the Wilderness to Petersburg from May to June '64. Maj. John E. Rylander was killed at Cold Harbor. Capt. James D. Frederick of Co A, was promoted in his place. They were at Deep Bottom Aug 16, '64 and Weldon R.R. Aug 21, '64 and remained on the lines at Petersburg until the withdrawal Apr 2, '65. Maj. Frederick was wounded at Deep Bottom and the command of the Battalion eventually fell to Capt. Caleb Hill of Co A. Their last battle was at Farmville Apr 7, '65."
I think Mr. Sibley was confused on the 10th Georgia Battalion, I searched google for any relation to the 3rd Georgia Battalion. I dont know where he found that they were also called "3rd Ga Bn". I dont see that anywhere.
Have a good night, Greg