UNION OHIO VOLUNTEERS

163rd Regiment, Ohio Infantry (National Guard)

Regiment organized at Camp Chase, Ohio, and mustered in May 12, 1864. Moved to Washington, D. C., May 13. Assigned to 1st Brigade, Haskins' Division, 22nd Army Corps, to June, 1864. Duty in the Defences of Washington, D. C., Headquarters at Fort Reno, till June 8. Moved to Bermuda Hundred, Va., June 8-12. Attached to 1st Brigade, 3rd Division, 10th Army Corps, Army of the James. Reconnoissance on the Petersburg & Richmond Railroad June 14-15. Skirmish on Petersburg and Richmond Turnpike June 15-16. Moved to Wilson's Landing June 16. Fatigue duty building Fort Pocahontas and scouting on west side of the James River till August. Ordered to Columbus, Ohio, August 29, and mustered out September 10, 1864.

Regiment lost during service 29 Enlisted men by disease.
http://www.civilwar.nps.gov/cwss/regiments.cfm

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163rd OH Infantry ( 100 days )

Organized: Camp Chase, OH on 5/12/64
Mustered Out: 9/10/64 at Camp Chase, OH

Officers Killed or Mortally Wounded: 0
Officers Died of Disease, Accidents, etc.: 1
Enlisted Men Killed or Mortally Wounded: 0
Enlisted Men Died of Disease, Accidents, etc.: 28
(Source: Fox, Regimental Losses)

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OHIO
ONE HUNDRED and SIXTY-THIRD INFANTRY
(One Hundred Days)

One Hundred and Sixty-third Infantry. - Col., Hiram
Miller; Lieut-Col., John Dempsey; Maj., Aaron S. Campbell.
This regiment was organized at Camp Chase, May 12, 1864, to
serve for 100 days. It was composed of the 48th regiment, Ohio
National Guard, from Richland county; 72nd battalion, from
Henry county; 96th battalion, from Ashland county; and the 99th
battalion, from Stark county. On May 13 it proceeded to Wash-
ington, D. C., under orders from Gen. Heintzelman, commanding
the Department of Ohio. It was assigned to duty with headquar-
ters at Fort Reno, D. C., where it remained until June 8, when
it was ordered to the front and proceeded in transports to
White House, Va., thence to Bermuda Hundred. It reported to
Gen. Butler, at Point of Rocks on June 12 and on the 14th took
part in a reconnaissance on the Petersburg & Richmond railroad.
On the 15th, 250 men of the regiment were engaged in a severe
skirmish and on the 16th it proceeded to Wilson's landing.
From that point made several reconnaissance's on the west side
of the James. On Aug. 29 it was relieved from duty and pro-
ceeded to Columbus, Ohio, where it was mustered out on Sept.
10, 1864, on expiration of term of service.

Source: The Union Army, vol. 2

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The U. S. Army Military Institiute, Carlisle Barracks, Penn., holds one enlisted man's letter in their unit bibliography

USAMHI
RefBranch
laf & ds Sep 96

163d Ohio Infantry Regiment
The following pertinent personal papers are in the Institute's Manuscript Archive:

Longnecker, Benton LeighColl Bk 27: #84 (Enlisted man Co E letter to sisters, May 13, 1864)

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See also:

http://www.google.com/search?client=safari&rls=en&q=163rd+ohio+volunteer+infantry&ie=UTF-8&oe=UTF-8