The 1st Louisiana Regulars were part of Withers' division during the Confederate invasion of Kentucky between 28 August and 19 October. It missed the Battle of Perryville because Withers' Division was detached to support other Confederate forces near Lexington on the day before Perryville, 7 October. The regiment retreated into Tennessee with the army and encamped at Tullahoma. It suffered 102 casualties at the Battle of Stones River between 31 December and 2 January 1863. Farrar was mortally wounded in the battle and died the day after it ended. For his conduct at Stones River, Jaquess was court martialed and cashiered on 13 February, being replaced as colonel by Strawbridge. Strawbridge, having moved up to lieutenant colonel after Farrar's death, became the final colonel of the regiment. Major F.M. Kent became lieutenant colonel and Company H Captain S.S. Batchelor became major. After supporting the army reserve artillery in the spring and summer of that year, the 1st Louisiana Regulars were temporarily consolidated with the 8th Arkansas Infantry to fight in the Battle of Chickamauga between 19 and 20 September.