Dear Friends; I do not wish to add to the confusion.
And having said that I will proceed to add to the confusion.

Yellow Fever was a crazy thing;
It symptoms ranged from a mild flu like symptoms with a head ache, to violent and Horrible (Very Horrible) death. Thus - Many people had Yellow Fever and were thus immune and never realized this. Perhaps Mrs. Rockwood was sick at the time, who knows.

The Swett Family were quite wealthy and very Pro - Confederate.
Anna either has or will have Major Charles Swett on her blog.

There was a connection between Mrs. Rockwood and the McRae family (Disremember what). They lived in the Old Bank Building (Anna) at the corner of perhaps Monroe and Main Streets down the hill from the Old Court House.

The Vicksburg Fire Department was a volunteer outfit until about 1880s.
Quite an honor, they celebrated with big parades, and whatever.
In the 1880s, Newsppaer man Marmaduke Shannon was an old man and ex Fire Chief.
He was too old to march, so they went and got him and he led the parade in a buggy.

Sam P