I had two Great-Great Grandfathers who served in the G.A.R. during the Civil War.
One of my Great-Great Uncles was Joseph Workman from Wiconisco, Pennsylvania, who enlisted in the 96th Regiment September 23, 1861and reenlisted February 15, 1864. He was wounded in the left leg in a charge on the Rebels at Spotsylvania on May 10, 1864, was taken prisoner and died in Rebel hands June 9, 1864.
My wife has a Great Grandfather who survived the infamous Andersonville POW camp.