The unit is described in a "morning report" of that date as a temporary battalion under the command of Captain Charles J. Turnbull with 484 present for duty.

[5] Special Order Number 47, Army of the West, dated 10 April 1862 at Des Arc, Arkansas, signed by General Earl Van Dorn ordered the infantry companies of Captains Reinhard, Byers, Sloan, Hufstedler, Morgan and Oates to move to Memphis via steamer, under the command of Captain Turnbull and there to report to Brigadier General Albert Rust who was to organize them into a regiment with the companies of Adams, Rodgers, McCray, and Adair, but the election of officers was to be deferred until all the companies were present.

[5] Special Order Number 67, Army of the West, dated 27 April 1862 at Memphis, Tennessee, directed that Turnbull's Arkansas Regiment be organized and an election of officers be held at once.

[9] The new regiment was assigned to Thomas James Churchill's brigade of General Van Dorn's Army of the West by Special Order Number 64, dated April 24, 1862, from Memphis.

[8] In accordance with Confederate Adjutant and Inspector General's Office Order Number 131,[10] ten soldiers of the regiment were recognized for courage and good conduct on the field for the Battle of Murfreesboro[11] Following the Battle of Murfreesboro, the unit was officially redesignated as the 25th Arkansas Infantry.

[8] Heavy casualties suffered at Murfreesboro in McNair's Brigade caused several field (temporary) consolidations among its regiments.

Walker's (later French's) Division of the Army of the Department of Mississippi and Eastern Louisiana, under the overall command of General Joseph E. Johnston who was assigned the mission of organizing a force to attempt to relieve Lieutenant General John C. Pemberton's besieged army at Vicksburg.

Johnston hastily withdrew his force across the Big Black River and Champion's Hill battlefields with Sherman in pursuit.

The heaviest fighting in the Siege of Jackson came on July 11 during an unsuccessful Union attack, which resulted in heavy casualties.

[16] Following the Battle of Chickamauga, NcNair's Brigade moved back to central Mississippi to oppose General Sherman's Meridian Campaign.

The Meridian campaign was a "dress rehearsal" for the style of war against infrastructure that Sherman, as well as some of these very troops, would later practice in Georgia.

To counter the threat, Confederate President Jefferson Davis ordered troops to the area from other localities, including McNair's Brigade.

The unit participated in the following campaigns and engagements: After the Battle of Nashville, Tennessee, the Arkansas regiments of Reynolds' Brigade marched via Bainbridge, Alabama, Tuscumbia, Iuka and Corinth to Tupelo, Mississippi, where they went into camp on January 10, 1865.

In black painted outline figures, 2-1/2 inches high, is the designation 30TH REG, ARK INF on the upper and lower borders, respectively.

[22] After the surrender, the men were offered free rail transportation (where available) in the direction of their homes, by what was left of the Southern railway companies.

A large number of men were killed or seriously injured in a railroad accident at Flat Creek Bridge, Tennessee, on May 25, 1865.