Check this fellow out:

Joseph M. Knap

Residence Philadelphia PA; a 24 year-old Manager Iron Works.
Enlisted on 7/20/1861 as a 1st Lieutenant.
On 7/20/1861 he was commissioned into "L" Co. PA 28th Infantry
He was discharged for promotion on 8/5/1861
(Estimated date of discharge for promotion)
On 8/5/1861 he was commissioned into PA Batty E Light Artillery
He Resigned on 5/16/1863
On 6/27/1863 he was commissioned into "Knap's" Co. PA Indpt Light Artillery
He was Mustered Out on 8/16/1863
On 5/19/1864 he was commissioned into Field & Staff PA Knap's Light Artillery
He was Mustered Out on 9/6/1864
Promotions:
* Capt 8/5/1861
* Capt 6/27/1863 (As of Knap's Indpt LA)
* Major 5/19/1864 (As of Knap's Indpt LA)
He was described at enlistment as:
5' 9.0", light complexion, blue/gray eyes, brown hair
Other Information:
born 12/30/1837 in Brownsville, NY
died 6/21/1920 in Catskill, NY

Sources used by Historical Data Systems, Inc.:

- History of Pennsylvania Volunteers, 1861-1865
- Information provided by HDS subscribers