For more "generalship as management," you can read another classic, Caesar's Gallic War. One caveat: a lot of modern Classics scholarship would rather take this less as an example of great generalship and more as an example of great propaganda. But either way it's a treatise on how to command, containing if not quite the unvarnished truth, at least Caesar's opinions of what good management/generalship ought to look like, as well as several anti-models.