Report of the Adjutant General of the State of Indiana

Volume IV page 84

Sixth Regiment Infantry
Enlisted Men Company “G.”
Privates

Name: Barr, John Residence: Elizabethtown Date of Muster: Sept. 20, 1861
Remarks: Must’d out Sept. 22, ’64.

To get more information about his military service you can order his Compiled Military Service Record (CMSR) from the National Archives

I didn’t find a listing for a John Barr with the 22nd Indiana in the Civil War Soldiers and Sailors System