Supposedly the Megarians broke the siege of Megara in 266 by coating pigs in pitch and lighting them on fire, spooking Antigonus' elephants and forcing his army to withdraw. This is the only reference to what TW calls "incendiary pigs," but in antiquity it was though that elephants were afraid of pigs. Livy records that during the Pyrrhic War Pyrrhus' elephants, as Pyrrhus attempted to capture the Roman camp, panicked when they heard the squealing of the pigs the Romans had brought for food and bolted. We're pretty sure that Livy isn't just making this up either, because some of Rome's earliest coinage features an elephant on one side and a pig on the other, minted soon after Pyrrhus' defeat