He was born in Pottsville, Pennsylvania (5). He was 20 years old when he was enlisted (5, 8 [21 at death in 1863]).
He was a salesman when he was enlisted (5).
He was 5 feet 8 inches tall, and had a light complexion, brown eyes, and brown hair (5).
He was enlisted and mustered into service on 21 October 1861 (1, 5). He was enlisted by Lieutenant Murphy, for three years, at Philadelphia, Pennsylvania (5). He served in company F (1).
He was promoted on 22 May 1862 to corporal (1, 4, 5).
He was promoted to sergeant on 1 January 1863 (1, 4, 5).
He was killed in action on 3 May 1863 at Chancellorsville, Virginia (1, 2, 3, 5, 8). He had last been paid through 28 February 1863, by Major Sheridan (3).
Since a death certificate was filed in Philadelphia, his body was probably sent to Philadelphia (8).
On 21 October 1864, his mother, Mary A Gebler, successfully applied for a pension (6, 7).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster)
2 consolidated morning report, 91st PA, 7 May 1863 (Sergt Gebler)
3 company F register of deaths (Joseph T Gebler)
4 company F, list of non-commissioned officers (Joseph T Gebler [?])
5 company F, descriptive roll, #65 (Joseph T Gebler)
6 pension index, by name (Joseph T Gebler)
7 pension index, by regiment, 91st PA Infantry, company F (Joseph T Gebler)
8 death certificate, Philadelphia, Pennsylvania, 3 May 1863 (Joseph T Gebler)
[I did not find an entry for him in the Ancestry index to the 1890 veteran's census (searched May 2007)]