Anthony,

They must not have read the description or seen the woodcut image of the Bowen/Missouri pattern flags that were surrendered there - and he described the flags from at least one brigade of Stevenson's Division - that of Cumming's which carried a red variant of the Missouri flags (which were blue). The flag of the 39th Georgia of this brigade survives today - smuggled out of Vicksburg.

There were indeed a number of First National flags used in this campaign - the 31st Alabama lost one at Champion Hill and some were taken from Vaughn's TN Brigade at Big Black River among others. The 23rd Alabama lost a flag at Port Gibson that was set back to Portsmouth, OH but I have never seen a description of it.

Greg Biggs