My Great Great Uncle, William S. White fought in the American Civil War. He served with the 20th Virginia Cavalry fighting under Jubal Early, participating in the last Confederate invasion of the North in July of 1864. He was 17 years old when he joined.
During the battle of Fort Stevens his A Company was selected as the rearguard and fought a nasty action against Federal Cavalry.

http://en.wikipedia.org/wiki/Battle_of_Fort_Stevens

During this action he was shot in the head, captured and sent to Elmira Prison Camp in New York state.

http://www.civilwaralbum.com/misc12/elmira1.htm

On October 2, 1864 he died of typhoid fever at the age of 18. I finally have a photograph of his grave site.