Thanks for posting this letter.
Along with the guy that wrote "One Of Jackson's Foot Cavalry" from the 21st Virginia, this shows that new ANV flags for Ed Johnson's Division came after Gettysburg and had, as their last battle honors, "Gettysburg."
Johnson's Division could not get ANV flags before that campaign due to the bunting shortage in the Richmond Depot.
This flag was offered for sale last year by an auction house in Cincinnati and I was able to see it before then.
Greg Biggs