Nearly 1,900 years before Ozzy Osborne and Black Sabbath made war pigs the subject of an antiwar song, Pliny the Elder chronicled a scene in which "the grunting of the hog" terrified the elephants of an invading army. According to contemporary histories, Roman legions either let pigs loose among elephants or suspended them from walls of a besieged city. In perhaps the most bizarre tale from the siege of Megara during the wars of the Diadochi in the 4th century, the Megarians poured oil onto a herd of pigs, lit them on fire, then drove them to the enemy lines. The invaders' war elephants bolted, killing vast numbers of soldiers. Some scholars believe the story is a misreading of tales in which flaming pig carcasses were catapulted over the city walls at invading soldiers.