It would appear that he was living in 1919 by virtue of correspondence with the War Department and the State of Georgia Pension Commission.

George Martin

From the CW Research Database

William H. Stallings

Residence was not listed;
Enlisted on 4/27/1861 as a 1st Lieutenant.
On 4/27/1861 he was commissioned into GA Blodget's Light Artillery
(date and method of discharge not given)

William H. Stallings

Residence was not listed;
Enlisted as a 1st Lieutenant (date unknown).
He also had service in:
"C" Co. GA Blodget's Light Artillery

From the NPS Soldiers & Sailors System

William H. Stallings (First_Last)
Regiment Name Capt. Milledge's Co., Georgia L. Art'y.
Side Confederate
Company
Soldier's Rank_In 1 Lieutenant
Soldier's Rank_Out 1 Lieutenant
Alternate Name
Notes
Film Number M226 roll 57

Milledge's Battery was formed during the spring of 1861. The company was sent to Virginia and assigned to C. Richardson's and W. Nelson's Battalion of Artillery. It served in the Richmond area until September, 1862, then was active from the Maryland Campaign to Cold Harbor. Later the company fought with Early in the Shenandoah Valley and around Appomattox. However, no members of the unit were present on April 9, 1865. It was commanded by Captain John Milledge, Jr.

William H. Stallings, enrolled April 27, 1861 at Augusta, Georgia in Co. I, 3d Georgia Infantry (Later became Capt. Milledge's Company, Georgia Light Artillery, later recorded 1st Lieutenant in Captain Foster Blodgett's Jr., Company, (Blodgett's Volunteers) Later (1st) Co. I, 3rd Regiment Georgia Infantry, by Special Order became Capt. Milledge's Company, Light Artillery, August 5, 1861, his file contains some 28 cards, many of which are Requisitions for forage for 97 horses and one requisition for clothing for some 127 men, three cards are from the US Army Adjutant General's Office to the Georgia State Pension Commission dated June 21, 1919 which note Stallings served until October 31, 1864, one voucher is dated January 3, 1862 at Manassas

A Corp. George E. Stallings also served in his company