Well, I for one thing Marshall actually did substantial harm. He offered data free opinions and expected not to be questioned or held to rigour. Ignoring 99% of what Marshall ever wrote does not impede anyone's understanding.
I agree.
"On the plains and mountains of the American West, the United States Army had once learned everything there was to learn about hit-and-run tactics and guerrilla warfare."
T.R. Fehrenbach This Kind of War
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