The website for the Vicksburg National Military Park can be reached by clicking on the above link.
The National Park Service has created quite a nice website for this battlefield, and some genealogical information is available on-line. A compiled list of Confederate soldiers who signed the parole after Pemberton's surrender is available.
It's quite an amazing website, and one that a history buff can spend hours investigating.
The following is a list of the Coffee/y Confederates defending at Vicksburg:
Last First MI Rank Unit State Unit Co. Paroled in
COFFEE CALVIN PVT 59TH TN INF I FIELD
COFFEE CLEVELAND PVT 52ND GA INF F FIELD
COFFEE GEORGE H PVT 59TH TN INF I FIELD
COFFEE JACOB B PVT 59TH TN INF I FIELD
COFFEE JAMES A CPL 36TH GA INF E FIELD
COFFEE JOEL PVT 59TH TN INF I FIELD
COFFEE JOHN V PVT 31ST TN INF I FIELD
COFFEE L PVT 20TH AR INF A FIELD
COFFEE N T CSGT 27TH AL INF A HOSP
COFFEE WILLIAM N PVT 39TH GA INF A FIELD
COFFEY J B 2SGT 2ND MO INF B FIELD
COFFEY JOHN G PVT 34TH GA INF A FIELD