Did UFOs intervene in the Battle of Tyre, circa 332 BC? Antonio Huneeus writes article, "Deconstructing the Alexander the Great UFO Story," which encourages restraint due to lack of credible sources. It seems, the flying silver shields may have been shields filled with sand and boiling excrement catapulted back at soldiers from the Tyrian fortress? Sources are equally interesting, "Wonders In The Sky," by Jacques Vallee and Chris Aubeck; also, Yannis Deliyannis' article, "Did Alexander the Great really see UFOs," both, worth checking out! Most interesting of all, the Alexander Romance genre, something close to medieval fantasy or science fiction. You'll have to read the article to find out what powered Alexander's flying machine? It's interesting stuff!