Oh, and this appears to be your uncle, William Kerlin's brother.

Name: John H Kerlin ,
Residence: Spalding County, Georgia
Enlistment Date: 3 May 1862
Service Record:
Enlisted as a Private on 03 May 1862
Enlisted in Company I, 13th Infantry Regiment Georgia on 03 May 1862.
Surrendered Company I, 13th Infantry Regiment Georgia on 09 April 1865 in Appomattox Court House, VA

Here's a short history of the 13th Georgia Infantry.

13th Regiment, Georgia Infantry

13th Infantry Regiment [also called Bartow Light Infantry] completed its organization in June, 1861, at Griffin, Georgia. Its members were recruited in the counties of Pike, Randolph, Early, Muscogee, Meriwether, Fayette, and Troup. This regiment first served in Western Virginia, then in December was ordered to Charleston, South Carolina, where it reported to General R.E. Lee. During the spring it fought at Whitemarch Island and soon moved back to Virginia. Brigaded under Generals Lawton, John B. Gordon, and C.A. Evans, it served with the Army of Northern Virginia from the Seven Days' Battles to Cold Harbor. The regiment was then involved in Early's Shenandoah Valley operations and the Appomattox Campaign. The unit lost 9 killed and 19 wounded at Second Manassas, had 48 killed and 166 wounded at Sharpsburg, and sustained 13 casualties at Second Winchester. Of the 312 engaged at Gettysburg, more than forty percent were disabled. It surrendered 12 officers and 161 men. The field officers were Colonel John H. Baker, Marcellus Douglass, Walton Ector, and James M. Smith; Lieutenant Colonels S.W. Jones and Richard Maltbie; and Majors James A. Long and John L. Moore.