George Martin
From "Vicksburg is the Key, The Campaign for Vicksburg, Vol. 1, Edwin Cole Bearss, Morningside, 1985, notes:
March 11, 1863
"The fort's armament included seven guns mounted in barbette. From left to right, the guns were: . . . Number 3, a 3-inch Whitworth rifle on field carriage, served by a detachment from the Pointe Coupee Artillery, commanded by Lt. J. Q. Wall."
p. 506
March 13/14
" . . . the Southerners did not escape unscathed. One of the XI-inch shells from Chillicothe passed through the parapet, displaced a cotton bale, and ignited a tub of cartridges in the magazine of the Whitworth rifle. Combating the inferno that ensued, Lieutenant Wall and 15 men belonging to the Pointe Coupee Artillery were burned, some seriously."
p. 524
FORT PEMBERTON, MISSISSIPPI
(Yazoo Pass Expedition)
Also Known As
Fort Greenwood
13 February 1863
OR-Series I, Volume XXIV, Chapter XXXVI, Pg 379
Confederate Forces
Detachment, Waul’s Texas Legion --- Colonel Thomas Neville Waul
Partial Casualty List
Lieutenant J. Q. Wall - Wounded
http://www.fortunecity.com/victorian/pottery/1080/fort_pemberton_ms_13feb63.htm