This looks like the proverbial needle in the Hay Stack.

It doesn’t appear that Lockwood of the 34th Indiana is the one.

Alfred Lockwood
Residence Montpelier IN;
Enlisted on 1/28/1864 as a Private.
On 1/28/1864 he mustered into "I" Co. IN 34th Infantry
He was discharged on 7/11/1864

Thirty-fourth Infantry INDIANA

It was in the engagement at Port Gibson, making a charge and
capturing 2 field pieces and 49 prisoners, with a loss of 49
in killed and wounded; was at Champion's hill, where it
captured the 46th Ala., with its colors and field officers,
losing 79 men in killed and wounded, was in the siege of
Vicksburg until the surrender and was then engaged at Jackson.

Sources used by Historical Data Systems, Inc.:
- Report of the Adjutant General of the State of Indiana