Everett, I can help with this much..Perhaps another can add to this..Pension file will probably be a big help, also, to you..
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American Civil War Soldiers
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Name: Albert Altman
Enlistment Date: 20 Sep 1861
Side Served: Union State Served: Pennsylvania
Service Record: Enlisted as a Corporal on 20 September 1861.
Enlisted in Company I, 11th Infantry Regiment Pennsylvania on 20 Sep 1861.
Discharged from Company I, 11th Infantry Regiment Pennsylvania on 8 Aug 1865.
Sources: 18,42
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I hope I got all these numbers correct for you..

Albert A. Altman applied 4/10/1877--Co I 11th PA Infantry--Application No--233.759--Cert No---180.891

Mary Ann Altman applied for pension in OK-- 2/10/1915 as widow-- Application No--1041.359--Certificate No 794.279
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11th Regiment Pennsylvania Volunteers --3-Years Service --Company I--Recruited at Greensburg, Westmoreland County

http://www.pa-roots.com/~pacw/infantry/11th/11thcoi3yr.html
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1900 United States Federal Census > Oklahoma > Custer > Deer Creek > District 38 pg 10b

Alber Altman 60 --7/1839--PA, PA, PA--married 27 yrs
Mary A Altman 46 --9/1853-IN, Germany, Germany--8 children 6 living
George Altman 17 --11/1882 MO, PA, IN
Gertie M Altman 10 --10/1889--MO, PA, IN
Anna Altman 7 --2/1893 OK, PA, IN
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1910 United States Federal Census > Oklahoma > Custer > Deer Creek > District 120 pg 22a

Albert Altman 70 PA, PA, PA--married 37 yrs
Mary Altman 56 IN, Germany, Germany--8 children with 6 living
Girtie Altman 20 MO, PA, IN--daughter
Floyd Vickers 24 MO, MO, MO--son-in-law--married 0 yr
Annie Vickers 17 OK, PA, IN---daughter
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Gay