5th Pennsylvania Cavalry.
My Great-great Grandfather and two coworkers’ ancestors also “jined” this particular cavalry. According to this (http://www.pa-roots.com/pacw/cavalry/5thcav/5thcavcoc.html) roster, Elias L. Hyneman was a Sergeant who enlisted July 26, 1861, for three years.
Captured June 29, 1864; died at Andersonville, Ga., February 7, 1865; grave # 12,610; Vet
His grave is actually in Philadelphia. In 1866, his family and the Civil War equivalent of "Zaka" went to Andersonville and retrieved the remains for Jewish burial.