(Shoup's Battalion)

Trigg's (Austin) Arkansas Battery Capt. John T. Trigg [2S6LB-2H12LB]
Calvert's (Helena) Arkansas Battery Capt. J. H. Calvert [2S6LB-2H12LB]
Hubbard's Arkansas Battery Capt. George T. Hubbard [2S6LB-2R3IN]

Artillery Codes: Indicates Quantity and bore size
4S6LB - 4 x 6-lb Smoothbore
2H12LB - 2 x 12-lb Howitzers
1R 3IN - 1 x 3-inch Rifles
2Nap12LB - 2 x 12-lb Napoleon

http://www.custermen.com/DixieBoys/AOMShiloh.htm#ThirdCorps