Robert reached the Conscription age of 17, January 27, 1865. The last muster rolls for the regiment’s companies was that for the bi-monthly period Jan/Feb, 1865, believe dated March 5. If he enlisted soon after reaching 17, It’s possible his mustering Sergeant had not added his information into the records by this time.

Robert Alexander Thornburg
Birth: Jan. 27, 1848
Death: Nov. 24, 1944
Burial:
Wise Cemetery
Winchester
Jefferson County
Kansas, USA
Find A Grave Memorial# 85249402