My Great-Great-Great Grandfather fought in the American Civil War. We have very little from him. However, my father and uncle will tell me stories of my Great-Aunts talking about the wounds that he carried from the war. I found that amazing that I am hearing from a witness to a witness from a grand historical event.
I would like to point out that there is audio and video recording of Civil War veterans and civilians out there. A bit of it is on YouTube but it is sparse and often mislabeled. Recently I came across this gem. The man was 5 years old, but he was in the theater the night that President Abraham Lincoln was shot!
Lincoln Assassination Eyewitness (Feb 9, 1956)