OHIO STATEWIDE FILES - Following is a bit of history of the 128th OVI (Civil War)
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File contributed for use in USGenWeb Archives by
Civil War info for Ohio
Grace-Marie Moore Hackwell 
Shortyhack@aol.com
Grace-Marie's List of Civil War Web Sites
http://members.aol.com/shortyhack/links.html
September 20, 1998
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Following is a bit of history of the 128th OVI: 

From Dyer's Compendium

128th Regiment Infantry. Organized at Columbus and Johnson's Island, Ohio,
December, 1863, to January, 1864. Moved from Columbus to Sandusky, Ohio,
January, 1864. Guard duty at Sandusky and at Johnson's Island, Sandusky Bay,
till July, 1865. Moved to Camp Chase, Ohio, July 10, and mustered out July 17, 1865. Regiment lost during service 1 Officer and 63 Enlisted men by disease. Total 64. 

History of the 128th OVI

The 128th Ohio was occupied in guard duty within the borders of the state of
Ohio. It was organized in 1862, under Colonel Charles W. Hill, as a three year
Regiment. It served mainly at Johnson's Island, guarding Rebel prisoners.
Portions of the of the Regiment formed detachments in 1862 that chased Rebel
troops in West Virginia. It helped in the construction of defenses of Sandusky
Bay and maintained a high level of readiness for emergencies and service,
wherever needed. Soon after the surrender of the rebel armies the Regiment was
sent to Columbus and mustered out at Camp Chase on July 10th, 1865. 

I am sorry that I have no more for you.    If I were you,  I would definently
order  his  Service records and  possible pension records from the National
Archives.   http://www.ristenbatt.com/genealogy/civilwar.htm#NA
Ordering from National Archives.  These records have always proved very
informative for me in my research.