(Wishing posts were editable!)
Vegetius is online also, a full text in Latin, a maybe full text in English (chopped up into tiny fragments), a partial text in English (in a single chunk); the links are on
David Camden's site, which is by far the most nearly complete place to check for Latin texts (and translations into any language).
The flaming horns of various animals show up regularly in Graeco-Roman literature; an example presented as actually having occurred is in the Life of Fabius Maximus, by Plutarch. Plutarch's Lives are widely available online, almost always in the 18c translation called Dryden's (not by Dryden at all, although under his general editorship; then revised several times finally by Clough in the 19c), and lacking local links. I finally got tired of the no-links, so have just about finished putting them up myself, in the Loeb edition, translation by Bernadotte Perrin. (The usefulness of the local links underscored now, since I can send you
directly to the passage in question.)
I agree as to the modern usefulness; people do not change, and Plutarch is probably the most useful to a modern strategist. On the other hand, the general principles of strategy, too, are essentially "people", and a close reading of Frontinus et al. does pay off. I'll be working at this for the foreseeable future.
BT
[url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/history/American_and_Military/home.html]
American and Military History[/url]