I found this in Roster And Compiled Service Records of The Jefferson Flying Artillery, ( Jefferson County, MS ) Also known as Harper's Battery and later as Darden's Battery

THE FIRST CONSOLIDATION CAME AFTER THE RETREAT FROM CORINTH, MISS. WHEN THE CONFEDERATE ARMY WAS REORGANIZED AT TUPELO, MISS. IN JULY OF 1862. AUSTON’S BATTERY (ARKANSAS) WAS DISBANDED AND ABOUT THIRTY MEN, DESCRIBED AS MOSTLY IRISH, WERE TRANSFERRED INTO DARDEN’S BATTERY JUST BEFORE THE KENTUCKY CAMPAIGN. THIS COMPANY SEEMS TO HAVE BEEN ORGANIZED IN THE NORTHEASTERN PART OF THE STATE OF ARKANSAS NEAR THE TOWNS OF PITMAN’S FERRY AND POCAHONTAS IN THE SUMMER OF 1861. IT WAS ASSOCIATED WITH TRIGG’S BATTERY WITH WHICH IT FOUGHT AT THE BATTLE OF SHILOH.

http://jeffersoncountyms.org/CivilWar/dardenbattery.htm