Name and regiment of your great uncle? We may have had this conversation before.
Would you please look at a CSR on Jean Pierre Brung at
https://www.fold3.com/image/271/65581176
I cannot make out the second line of the Remark section, beginning "20, 1862, ???? Hd. Qrs."
It is probable that Jean sounded like Jian, so someone wrote it that way. And Pierre on the hand-written census forms certainly looks like Piene/Peine. There were lots of Bourgs back in southern La, but not necessarily a common name in Vicksburg.
As always.....thx...../anna