[4] When the indifferently-dressed pro-Southern Missourians first saw Hebert's regiment, they were impressed with its neat gray uniforms and the officers' gold braid.

The 3rd Louisiana and the 2nd Arkansas Mounted Rifles met the regulars in a cornfield and defeated them after a fight lasting one hour.

[6] A second Union column led by Franz Sigel advanced from the south and enjoyed a brief success.

[7] Finally, the 3rd Louisiana joined the main battle against Lyon on Oak Hill, taking a position on the right flank next to the 3rd Texas Cavalry Regiment.

[10] On 7 March, McCulloch was killed early in the fighting[11] and the division's second-in-command James M. McIntosh was shot dead soon afterward.

[12] At about the same time, Hebert (who was third-in-command) led the 3rd Louisiana and the 4th, 14th, and 15th Arkansas infantry regiments into Morgan's Woods.

When the staff officers of the fallen generals went looking for Hebert, he had disappeared into the woods, leaving McCulloch's division leaderless.

[16] On 15 March, Hebert and Tunnard were released from captivity in exchange for two captured Federal officers, Francis J. Herron and William P.

Accordingly, the Confederates marched from Van Buren to Des Arc, Arkansas where the troops boarded vessels that took them to Memphis, Tennessee.

The Louisiana soldiers quickly broke into the sutler stores and helped themselves to a variety of food, which was much better than their usual diet of beef and hoecake.

[22] In the Battle of Iuka on 19 September, the 3rd Louisiana fought in Hebert's brigade, Lewis Henry Little's division, Price's corps.

Finally, the 5th Iowa started taking fire from the 1st Texas Legion and its three left flank companies were mauled.

When Hebert sent the 40th Mississippi to attack the Federal right flank, the 5th Iowa retreated, having suffered 217 casualties in 75 minutes of battle.

[25] Later, when a Federal attack threatened to overrun the regiment, Lieutenant Colonel Gilmore led a charge that drove them back.

[27] At the Second Battle of Corinth on 3–4 October 1862, the 3rd Louisiana Infantry was in W. Bruce Colbert's brigade, Hebert's division, Price's corps.

[32] Green's two right-hand brigades smashed through the Union defenses and took Battery Powell, but suffered heavy losses.

[2] In the Siege of Vicksburg, 18 May – 4 July 1863, the 3rd Louisiana Infantry commanded by Lieutenant Colonel Russell and seconded by Major Pierson was in Hebert's brigade of John Horace Forney's division.

[37] On 25 June, the Union forces exploded a mine under the 3rd Louisiana Redan and killed six men and wounded 21 more.

[4] The Federals occupied the crater left by the explosion, but the Confederates were able to throw grenades into the seized position, inflicting about 30 casualties.

The unit marched to Camp Boggs in Shreveport in August 1864 and mounted guard duty there for the remainder of the war.

During this period, the 3rd Louisiana was assigned to Allen Thomas's brigade in Camille de Polignac's division.