Kevin Levin points out the genesis of Glatthaar's new book predates Beatie's Army of the Potomac, so Glatthaar could not have been inspired by the series, as I had speculated.
Kevin believes the book to be "tightly reasoned" which (if I agreed) would simply be the characteristic of an historical essay, that is, a literary production that uses certain historical material.
I'm going to revisit this book again in a post that compares the citational and bibliographic m.o. offered by Glatthaar, Goodwin, and Beatie.