have you ever heard of the book, CALLOW, BRAVE & TRUE, A GOSPEL OF CIVIL WAR YOUTH by University of ME Professor Jay Hoar?
"the littlest rebel" was from GA & had not quite reached his 7th birthday, upon date of enlistment (he was "the mule-riding mail-carrier" for an AL IN regiment until 1863.) & the "littlest bluecoat" was barely 8YO, when "he went to war" with his father (the child's mother had died in childbirth & there was nobody to stay with, so his father took him to war. he became a drummer.)= BOTH, before war's end, were wearing arms & IN "the shooting war".
(thankfully, BOTH survived TWBTS & both received WBTS pensions.)