The Arrows of Hercules
L. Sprague de Camp
 The protagonist is the engineer Zopyros of Tarentum, a follower of the Pythagorean philosophical school. Having invented an improved type of catapult, he is drafted into Syracuse's war effort against Carthage by the tyrant Dionysios, creator of the first military ordnance department known to history. The historical Battle of Motya of 399 BC is a major event in the novel. Also portrayed is the incident upon which the legend of the Sword of Damocles is supposedly based.