According to an affidavit given by Edgar Eyde, orderly sergeant of Company K, on 2 Oct 1865, Reuben was wounded in the right hand and both legs and during the Battle of the Wilderness near Spotsylvania VA. As a result, his right index finger was amputated.
 
other sources
Barbara F. Elliott - personal knowledge
Melvern Evans, Jr family research
Mt Bethel Cemetery records
Military Records and Pension file: XC-2691,893
1870/1880 Lancaster County Census records
Holy Trinity Church Records
R.E. Fielis original military papers
Columbia PA 1869 city directory
Lancaster Co. PA Land Transaction Records