I believe its one of these 2 guys:
John H Handley was living in Richmond in 1850 appears to have been in the 1st Light Artillery at least initially as a private.
1850 census
Name John Handley
Gender Male
Race White
Age 8
Birth Year abt 1842
Birthplace Virginia
Home in 1850 Howard, Missouri, USA
Attended School Yes
Line Number 20
Dwelling Number 3
Family Number 3
Inferred Father
Zenas Handley
Inferred Mother
Emeline Handley
Household Members (Name) Age
Zenas Handley
37
Emeline Handley
25
John Handley 8
Wm F Handley
5
E Handley
3
Wm Douglass
35
J Switzler
25
Wm D Witt
19
1880 census
Name John F. Handley
[John H.]
Age 36
Birth Date Abt 1844
Birthplace Virginia
Home in 1880 Blackburn, Saline, Missouri, USA
Race White
Gender Male
Relation to Head of House Self (Head)
Marital Status Married
Spouse's Name Margaret Handley
Father's Birthplace Virginia
Mother's Birthplace Virginia
Occupation Livery keeper
Neighbors View others on page
Household Members (Name) Age Relationship
John F. Handley 36 Self (Head)
Margaret Handley
37
Wife
James W. Handley
16
Son
Zems E. Handley
14
Son
Charles E. Handley
6
Son
1900 census
Name John H Handley
Age 58
Birth Date Mar 1842
Birthplace Virginia, USA
Home in 1900 East St Louis Ward 7, St Clair, Illinois
Ward of City 7-Part of
Street North Seventh Street
House Number 718
Sheet Number 17
Number of Dwelling in Order of Visitation 282
Family Number 321
Race White
Gender Male
Relation to Head of House Head
Marital Status Married
Spouse's Name Margaret A Handley
Marriage Year 1862
Years Married 38
Father's Birthplace Virginia, USA
Mother's Birthplace Virginia, USA
Occupation Horse Dealer
Months Not Employed 0
Can Read Y
Can Write Y
Can Speak English Y
House Owned or Rented Rent
Farm or House H
Neighbors View others on page
Household Members (Name) Age Relationship
John H Handley 58 Head
Margaret A Handley
58 Wife
Dies East St Louis 1906
https://www.newspapers.com/article/the-democrat-opinion/147285740/
Apprently was a livery / horse man-dealer for most of his life.
Find a grave:https://www.findagrave.com/memorial/114349276/
Second and best option is John C Handly, Saline Mounted Rifles, MSG Pvt. Then 2nd Lt Co F with Shelby (5th Mo Cav/Gordon's), wounded at Springfield sent home mid '63, no further record found as yet. Lived in Lexington MO before and after war. Age 45 in 1862. He was indicted for 2nd degree murder with a whole bunch of guys that appears to be a post war witch hunt. See https://www.newspapers.com/article/the-weekly-caucasian-aullville-case/147287343/
Known as the Aullville case its easily found just google it. 56 men were indicted in the case. https://www.newspapers.com/article/the-lexington-intelligencer-trial-in-lex/126175441/
Obit is here: https://www.newspapers.com/article/bates-county-republican-obituary-for-joh/147288169/
find a grave: https://www.findagrave.com/memorial/57051307/john-campbell-handly