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The 107th Regiment, Illinois Infantry was organized at Camp Butler, Illinois, and mustered in September 4, 1862. Duty was preformed at Saulsbury, North Carolina, until June 21. It mustered out June 21, 1865. [1].
For more information on the history of this unit, see:
The Civil War Archive section, 107th Regiment Infantry, (accessed 14 June 2012). Companies in this Regiment with County of Origin Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.
The following counties of origin are taken from the Adjutant General's Report, found on the Illinois Civil War Rosters web site. Roster pages are from the same report found on the Internet Archives web site. The rosters show the men who served in each regiment, their residences, dates of enlistment and mustering out, and other remarks.
Company G - many men from Williamson County - Williamson County web site - Roster, vol. 6, page 38.
https://civilwar.illinoisgenweb.org/history/107.html
https://www.cyberdriveillinois.com/departments/archives/databases/r...
https://dewitt.illinoisgenweb.org/reunion-news.htm
September 22, 1882
REUNION OF THE 107TH REGIMENT.
The 107th Illinois was substantially a DeWitt county regiment, for it had its origin in Clinton, and six of the ten companies were recruited in this county, the other four coming from Piatt county. The surviving members of the regiment are making arrangements to celebrate the twentieth anniversary of the organization, and to this end committees have been busy for the past few weeks sending out invitations to absent members who have removed from the county. The celebration will be held at the fair grounds, on the 4th of October. At ten o’clock the members of the regiment will form on the public square and march out to the fair grounds. Gen. White, of Chicago, will be present and deliver an address, and the Rev. John Wolf and the Rev. Levi Field will be prepared to give the history of the regiment. A general invitation is extended to all to attend, and as it is to be a basket picnic everybody is expected to come prepared. The occasion promises to be an interesting one, and we hope that our county will be well represented.