"Commission. September 4, 1861. 1 item (oversize).
Commission (parchment) signed by Governor John J. Pettus appointing Major Micajah F. Berry as aide-de-camp to Major General Jefferson Davis, Army of Mississippi, on September 4, 1861."

http://mdah.state.ms.us/manuscripts/z1881.html

"When Mississippi seceded from the Union, Davis resigned his Senate seat and became the major general of Mississippi state troops."

http://www.moc.org/site/PageServer?pagename=visit_wh_main

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David Upton