FYI, Here is the texts from the NPS plaques, this gives the type of cannon and what happened.

Lee

CALVERT'S ARKANSAS BATTERY

2 - 6 PRD. GUNS, 2 - 12 PRD. HOWITZERS

MAJ. T.R. HOTCHKISS' ARTILLERY BATTALION

CLEBURNE'S DIVISION

1ST LIEUT. THOMAS J. KEY, COMMANDING

1ST LIEUT. R. FITZPATRICK

1ST LIEUT. W.M. HOPWOOD

2ND LIEUT. J.G. MARSHALL

NOV. 25, 1863, MORNING

The battery occupied a position immediately over the tunnel in rear of this point during the fighting of the morning and with its rapid and accurate firing aided in keeping its near front clear of enemy.

About noon by orders of Gen. Cleburne, the battery moved to the right to Tunnel Hill where Lieut. Key was placed in command of all the artillery at that point.

The battery was commended by General Cleburne, in his official
report, for courage and efficiency. The battery retired with its division unmolested after dark by Chickamauga Station.

No casualties reported.

CALVERT'S ARKANSAS BATTERY

TWO 6-PRD, TWO 12-PRD HOWITZERS

MAJ. T.R. HOTCHKISS' ARTILLERY BATTALION

CLEBURNE'S DIVISION

1ST LIEUT. THOMAS J. KEY, COMMANDING

1ST LIEUT. R. FITZPATRICK AND W.M. HOPWOOD

2ND LIEUT. J.G. MARSHALL

NOV. 25TH, 1863 NOON
The battery occupied a position over the railroad tunnel during the fight of the morning, and with its rapid and accurate firing aided in keeping its front clear of the assaulting lines of the enemy. About noon, by orders of Gen. Cleburne the battery held this position with Lieut. Key in command of his own and a section of Swett's Battery without epaulments or other shelter taking an active part in repulsing the repeated and persistent assaults of the enemy, standing to their post, with the enemy nearly at the muzzles of their pieces.
Gen. Cleburne says the batteries at this point were bravely fought and did great execution. After dark the battery with its battalion withdrew unmolested across the Chickamauga.
Casualties: No guns or materials: men and officers not reported.

SWETT'S MISSISSIPPI BATTERY

FOUR 12-PRD. NAPOLEONS

MAJ. T.R. HOTCHKISS' ARTILLERY BATTALION

CLEBURNE'S DIVISION

NOV. 25TH, 1863

1ST LIEUT. H. SHANNON, COMMANDING (WOUNDED)

1ST LIEUT. JOSEPH ASHTON (MORTALLY WOUNDED)

2ND LIEUT. H.N. STEELE

CORPORAL F.M. WILLIAMS

The battery, excepting two guns sent to report to Colonel Govan, about noon occupied this position during the day's action. It was repeatedly charged, the enemy once penetrating to within 50 steps of the guns. The artillerymen maintained their position and used canister at short range. Lieut. H. Shannon commanding, was wounded. The command devolved on Lieut. Joseph Ashton, in a few minutes he was mortally wounded. The command then fell upon Corporal F.M. Williams. So many non-commissioned officers and men had been killed and disabled in the battery that a detail from the infantry was required to work the guns. Casualties not reported.