It’s not always the victors writing the history, in this case, or the historical markers:

On this site occurred the Colfax Riot in which three white men and 150 negroes were slain. This event on April 13, 1873, marked the end of carpetbag misrule in the South. Marker is at the intersection of Main Street (Louisiana Route 8) and 2nd Street (Louisiana Route 8) on Main Street.

Or maybe it was the victors writing, sadly enough.

At any rate, those Confederates were writing markers all over the place.
From the Gettysburg battlefield:

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I’ll leave it as an exercise for the reader to detect where the above writer’s Confederate sympathies crept out.