Thanks for the OOB. As follows:
>>>>>Gregg's Brigade
Col Cyrus A. Sugg:
3rd Tennessee: Col Calvin H. Walker
10th/30th Tennessee: Col Randall W. MacGavock (k), Ltc James J. Turner
41st Tennessee: Col Robert Farquarson
50th Tennessee: Ltc Thomas W. Beaumont
1st Tennessee Infantry Battalion: Maj Stephen H. Colms
7th Texas Infantry: Col Hiram B. Granbury
Attached units:
Bledsoe's Missouri Battery (3 guns): Cpt Hiram M. Bledsoe
Wirt Adams' Mississippi Cavalry (squadron): Cpt William S. Yerger
1st Mississippi Battalion State Troops (mounted): Cpt J. M. Hall
3rd Kentucky Mounted Infantry (joined after the battle): Col Albert P. Thompson
Wirt Adams' Mississippi Cavalry (full regiment, joined after the battle) : Col Wirt Adams
20th Mississippi Mounted Infantry (6 companies, joined after the battle) >>>>>>>>>>>
So far as I can tell no flag from any of the infantry units from this period survives. There are flags from the Donelson period that do (all of these infantry units had been captured at Fort Donelson in Feb. 1862 - a couple of those flags survive - all First Nationals and a period drawing shows the 7th Texas to have had a FN flag plus a newspaper image of the FN for the 30th TN). There are some post-this time frame flags that survive - AOT flag for the 3rd TN (1864) and AOT flag for the 41st TN (1864) plus an ANV style flag for the 50th TN (time frame not determined). The 50th TN should have been issued a Mobile Depot flag when they served there in early 1864.
Sadly, while we know a lot about CS flags there's still a ton we do not know and this period and battle is one of those instances. A number of First Nationals were taken in the battles before Vicksburg so we know those flags were there. We also know that Bowen's and Stevenson's Divisions used the Missouri pattern flag (the latter division's being an altered color - red with yellow borders and white cross). And we know that some ANV style flags were there (42nd GA flag taken at Champion's Hill - Fowler Guard) so Gregg's Brigade could have carried a hodge-podge of colors. I would bet that some were First Nationals.
Greg Biggs