I feel like the great lesson of the Civil War is that amateur armies of shopkeepers, farm laborers, and clerks can, when well armed and supplied, beat the absolute piss out of a chivalry-obsessed gentry class and their allies among the smallholders
Robert E. Lee got his ass beat at Gettysburg by a professor of rhetoric and oratory from Bowdoin College and generations of reactionary fantasists have died mad about it.