[5] Fully armed and equipped, the 39th departed the camp on Sunday, August 18, by rail to St. Louis, to join Brig.
[note 1] On Friday, September 6, Companies A, B,C, D,E, F, G, H, and I were sent to Macon, MO to guard the North Missouri Railroad (NMR).
[9][note 3] The following Sunday, April 13, the 39th, as part of the AoM, again boarded steamers and moved down the Mississippi to within a few miles of Fort Pillow.
[7] Remaining four days until Thursday, April 17, it steamed up the Tennessee River and disembarked at Hamburg Landing,[11] the Army of the Mississippi joined the other two under the overall command of Maj. Gen. Halleck.
[7] After pursuing the retreating Rebels as far as Boonville, the regiment returned to within five miles of Corinth and encamped on Clear Creek.
Through June, July, and August, the 39th continued training with officers' school, company, and battalion drill held daily.
Grant planned a double envelopment of the Confederate Army of the West, commanded by Maj. Gen. Sterling Price, with the AoM (including the 39th) attacking from the southwest, and three divisions of the AoT from the northwest.
[14] Soon engaged in a hard battle, the 39th was in Col Fuller's Ohio Brigade of BG Stanley's 2nd Division as it fought fiercely on Rosecrans' right driving the rebels' left out of town.
The following morning, the regiment was in Stanley's reserve southwest of the rail junction as the Confederates, now under Maj. Gen. Earl Van Dorn approached from the northwest.
[7] In response, on Friday morning, Rosecrans pushed three of his divisions into the old Confederate rifle pits north and northwest of town.
The 39th Ohio was in Stanley's division in the AoM's center where despite initial rebel successes, the regiment and its comrtades repulsed all Confederate attacks.
On July 25, 1862, in camp near Corinth, they turned these in and received National Armory contracted Eli Whitney manufactured Springfield Model 1861 .58- caliber rifled-muskets with saber bayonets.