|July||Organized near Richmond from the 3rd and 7th Louisiana Infantry Battalions under Colonel Edmund Pendleton (still in Federal prison after being captured in the Seven Days), Lieutenant Colonel Robert A. Wilkinson and Major McGavock Goodwyn.|
|July 26||The regiment was transferred to the newly-formed 2nd Louisiana Brigade with the 1st, 2nd and 10th Louisiana Infantry Regiments under Brigadier General William E. Starke, which was briefly attached to A.P. Hill’s Division.|
|Early August||The regiment, with Starke’s Louisiana Brigade, was transferred to Jackson’s Division|
|August 5||Colonel Pendleton was exchanged and returned to the regiment.|
Lt. Colonel Wilkinson was killed. Major Goodwyn was promoted to lieutenant colonel and Captain Andrew Brady of Company A was promoted to major. The regiment is referenced on a trailside marker on the Deep Cut loop trail on the Manassas battlefield.
The regiment was commanded by Colonel Edmund Pendleton.
From the War Department marker for the brigade on the Sharpsburg battlefield:
On the evening of September 16, Starke’s Brigade formed line perpendicular to this road on the left of Taliaferro. When the Brigades of Jones and Winder were forced back on the morning of the 17th, this Brigade advanced with Taliaferro’s and the rallied Brigades, but was driven back. Supported by Early’s Brigade it again advanced, but was obliged to retire and reformed, with its Division, beyond the West Woods, where it supported the assault of McLaws’ Division on Sedgwick’s Division of Sumner’s Corps. During the engagement, General Starke was killed and the command devolved upon Colonel L. A. Stafford of the 9th Louisiana.
The regiment was in reserve.
Colonel Edmund Pendleton and Lt. Colonel Goodwyn were wounded.
The brigade helped cut off the retreat of Union General Milroy’s army from Winchester, turning it into a rout and destroying Milroy’s command.
The regiment was commanded by Major Andrew Brady and brought 186 men to the field. It lost 3 men killed, 35 wounded and an unknown number of missing or captured.
Early’s Shenandoah Valley Campaign
Assigned to Stafford’s Brigade (Colonel Eugene Waggaman commanding) of Brigadier General Zebulon York’s Consolidated Louisiana Brigade in Gordon’s Division of the Army of the Valley
|Summer||Major Brady left for detached duty in Louisiana and the Trans-Mississippi.|
Commanded by Captain H.J. Egan
Lieutenant Colonel Goodwyn was wounded.
|October||The ten regiments of the Louisiana brigade were reorganized as a battalion of six companies with less than 500 men, although it would continue to be referred to as a brigade. Colonel Raine Peck (at 6’3″ and 300 pounds known as “Big Peck”) was given command of the brigade.|
|December||The regiment left the Army of the Valley and returned to the Petersburg defences with the remnants of the Second Corps|
|February 18||Colonel Peck promoted to brigadier general and transferred to the Western Theater. Colonel Eugene Waggaman of the 10th Louisiana was given command of the brigade of 400 men.|
The 15th Louisiana Infantry surrendered 2 officers and 17 men. The entire brigade only had 373 men.