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12th Illinois Infantry (3 months)
in the American Civil War

Online Books:
12th Illinois Infantry (3 months) Soldier Roster - Report of the Adjutant General of the State of Illinois, Volume 1, Revised by Brigadier General J.N. Reece, Adjutant General, 1900       View Entire Book

Regimental History
Twelfth Illinois Infantry (Three Months' Service). Col., John McArthur; Lieut. -Col., Augustus L. Chetlain; Maj., William D. Williams. This regiment was organized at Springfield and was ordered to Cairo, where it formed part of the garrison, the other regiments being the 8th, 9th and 10th. During this three months' service the work of the soldier was made up of fatigue duty, building barracks, clearing off parade grounds, building fort defenses and the redan earthwork where the Ohio river unites with the Mississippi, to guard the confluence of those rivers from the possible advance of Confederate gunboats. The monotony of this period was broken only by one incident, a march into the swamps back of Commerce, Mo., after Jeff Thompson. The marching column was composed of battalions from the several regiments, including one from the 12th. The regiment was mustered out Aug. 1, 1861.

Regimental history taken from "The Union Army" by Federal Publishing Company, 1908 - Volume 3

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