I was incorrect, he was detached for service with a section [2] of Howitzers the year before.

Permanently detached service with Section howitzers since July of 63'
Promoted from Private to Corporal, January 1, 1864
Died from wounds May 13, 1864, Fayettville, Ark.
Deceased May 13/64, Killed accidentally
Killed accidentally by the "busting of a burn*" [sic] May 13, 1864, Fayetteville, Ark.

* Spelling could be "Bum"

M399: Compiled Service Records of Volunteer Union Soldiers Who Served in Organizations from the State of Arkansas