Here's an interesting link to a paper concerning the background of Civil War (American) fortifications:
https://apps.dtic.mil/sti/tr/pdf/ADA313032.pdf
This is of interest due to the large number of field fortifications left over form the war, and still reusable to varying degrees.
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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