If he mustered out/deserted on 25 Jan 1863, it is possible he did participate in Arkansas Post (Fort Hindman) fought two weeks earlier. (see below)
Jim Martin
Name: Cyrus N Tolles
Residence: Decatur, Illinois
Enlistment Date: 8 Aug 1862
Rank at enlistment: Private
State Served: Illinois
Survived the War?: Yes
Service Record: Enlisted in Company B, Illinois 116th Infantry Regiment on 06 Sep 1862.
Mustered out on 25 Jan 1863.
Sources: Illinois: Roster of Officers and Enlisted Men
Name: Cyrus N Tolles
Residence: Decatur, Illinois
Enlistment Date: 8 Aug 1862
Rank at enlistment: Private
State Served: Illinois
Survived the War?: Yes
Service Record: Enlisted in Company B, Illinois 116th Infantry Regiment on 06 Sep 1862.
Mustered out on 25 Jan 1863.
Sources: Illinois: Roster of Officers and Enlisted Men, Historical Data Systems, comp.. American Civil War Soldiers [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 1999.
Original data: Data compiled by Historical Data Systems of Kingston, MA form the following list of works.
Illinois. Adjutant General. Roster of Officers and Enlisted Men. 9 vols. Springfield. 1900.
Regimental History
ILLINOIS
ONE HUNDRED AND SIXTEENTH INFANTRY
(Three Years)
One Hundred and Sixteenth Infantry - Col., Nathan W. Tup-
per; Lieut.-Cols., James P. Boyd, Anderson Froman, John E. Mad-
dux; Majs., Anderson Froman, Austin McClurg, John S. Windsor.
This regiment was recruited almost wholly from Macon county,
numbering 980 officers and men when it started from Decatur for
the front on Nov. 8, 1862. CO. F was from McLean county, Co. H
from Christian and Shelby counties. The regiment went into
Camp Macon near Decatur and was mustered into the U. S. service
on Sept. 30, 1862. 0n Nov. 8,it was ordered to Memphis via
Cairo, to join Gen. W. T. Sherman's 15th army corps, and was
assigned to the 1st brigade, 2nd division. In December the
regiment received its baptism of fire in the battle of Chicka-
saw bluffs, the officers and men fighting so gallantly as to
receive the highest compliments from the veterans of the older
regiments in the brigade. It then passed down the Yazoo to the
Mississippi river and up that and the Arkansas river to Arkan-
sas Post, where in Jan., 1863, it fought its second battle sus-
taining heavy losses. The casualties in Co. B were particu-
larly severe, the company coming out of the battle with but 25
men. In March the regiment went up the Black bayou and Deer
creek in company with the 8th Mo. to save Admiral Porter's
fleet from the clutches of the Confederates, which was done af-
ter a hard fight. The regiment engaged in the battles of Cham-
pion's hill and Black River bridge, and in the bloody charges
on the Vicksburg fortifications in May, losing heavily. Being
transferred to eastern Tennessee, the 116th Ill. and 6th Mo.
regiments floated down the Tennessee river in pontoon boats to
the mouth of Chickamauga creek, on the night of Nov. 23, cap-
turing the Confederate pickets and holding the position until
the whole corps had crossed over. The brigade formed the ex-
treme left of Gen. Sherman's army, and obtained the credit of
turning the enemy's right flank at the great battle of Mission-
ary ridge. In May, 1864, with the rest of the Army of the Ten-
nessee, the regiment moved against the enemy and became hotly
engaged at Resaca, Ga., losing heavily, but driving the enemy
across the river and planting its colors on the Confederate
works. It was repeatedly attacked, but could not be driven
from the position gained. It lost heavily in the assault on
Kennesaw mountain. Upon reaching Savannah Gen. W. B. Hazen
selected nine regiments, including the 116th, to carry Fort
McAllister, and within 15 minutes after the bugle sounded
"Forward" the regimental colors were on the works and the gar-
rison captured. The regiment then participated in the campaign
of the Carolinas, at Bentonville, N. C., encountered for the
last time its old foe, Gen. Jos. E. Johnston's army, and fought
its last battle. From Goldsboro it started for Washington, via
Raleigh, Richmond and Alexandria, participated in the grand re-
view before the president, and was finally mustered out near
Washington on June 7, 1865.
Source: The Union Army, vol. 3