UFOs in Wartime by Mack Maloney

In the course of researching his novels, military fiction writer Mack Maloney discovered startling historical records of an increase of UFO sightings near pivotal military events. He discussed a variety of incidents from World Wars I & II, as well as Viet Nam and other battle zones. One of the earliest cases he found dated back to the time of Alexander the Great, when his army was planning a siege on the city of Tyre, and "flying shields" let out a lightning bolt that destroyed one of the city's walls, which allowed Alexander's army to get in.