Forth and last battle flag of the 11th Mississippi. Used after the Battle of Gettysburg until captured at Hatcher's Run, 1865.
Battle honors (clockwise from top): Manassas & Seven Pines, Manassas No. 2 & Boonsboro, Sharpsburg & Gettysburg, Gaines Farm & Malvern Hill.
http://www.11th-miss.com/flags.htm
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This is the best reference I could find.
GP