On my dad's side, my 4X gr-grandfather Moses J. Vanderpool, and his son Granville, were members of the 35th Missouri Infantry in 1862. Moses only served about 6 or 8 months, and was discharged "for age" (he was 42). Granville, only 20, spent most of his time on garrison duty in Arkansas. Participated in the defense of Helena, AR July of 63. Family tradition says he spent most of his time guarding kinfolks who were POWs...haven't found anything to verify that. I didn't find that there were any POW camps in Arkansas. Afterwards, Moses and Granville were both members of the GAR, and Moses was buried in his Army uniform in 1914, at the age of 94, at the Union Cemetery in Princeton, MO.
On mom's side, my 3X gr-grandfather William Pleasant Johnson, was from Staunton, VA, and "jined up" in May of 61. He was a member of Co.L 5th Virginia Infantry Regiment, 1st Brigade, under Col Thomas J. Jackson. He was wounded at 1st Bull Run, on Henry House Hill. He lost an eye from a shell fragment, and was later invalided out of the Army. After the War, he ended up in Alabama, and later, Arkansas. I got copies of his papers from the National Archives several years ago, when it was still free. I'm not sure what the fee is now.