I just came across a soldier on Find a Grave with only "Pvt, Civil War, Co. C, 16th IN Vol." I recognized that company. He served in the same company as my Great, great grandfather Rader (and his brothers). So I know exactly where he lived and who his family was. Small world!
Now, in addition to his WikiTree profile, I will update Find a Grave and FamilySearch.
It's neat to come across someone from here in these challenges.