Bonnet Carré hardly resembles the decorous greenswards of Gettysburg or Lexington. But this November, once its waters recede, Scott will lead some 500 costumed rebels over the spillway on foot and horseback in a reenactment of America’s largest-ever slave revolt. Chanting “On to New Orleans” and “Freedom or death,” they will retrace the little-known German Coast uprising of 1811 in a 26-mile march east along the Mississippi River, brandishing axes, muskets, blunderbusses, and cane knives as they cut an anachronistic swath through the nearby industrial towns.