In the first century BC, Lucretius

Lucretius

Titus Lucretius Carus was a Roman poet and philosopher. His only known work is an epic philosophical poem laying out the beliefs of Epicureanism, De rerum natura, translated into English as On the Nature of Things or "On the Nature of the Universe".Virtually no details have come down concerning...

 mused that early humans may have attempted to launch wild beasts, such as lions or "savage boars," against the enemy, but with catastrophic results. War pigs are pig

Pig

A pig is any of the animals in the genus Sus, within the Suidae family of even-toed ungulates. Pigs include the domestic pig, its ancestor the wild boar, and several other wild relatives...

s reported to have been used in ancient warfare

Ancient warfare

Ancient warfare is war as conducted from the beginnings of recorded history to the end of the ancient period. In Europe and the Near East, the end of antiquity is often equated with the fall of Rome in 476, and the wars of the Eastern Roman Empire Byzantium in its South Western Asian and North...

 as a countermeasure against war elephant

War elephant

A war elephant was an elephant trained and guided by humans for combat. Their main use was to charge the enemy, trampling them and breaking their ranks. A division of war elephants is known as elephantry....

s. According to legend recounted in the "Alexander Romance" by Pseudo-Callisthenes, Alexander the Great learned about this "secret weapon" against war elephants from Porus in India.

Pliny the Elder

Pliny the Elder

Gaius Plinius Secundus , better known as Pliny the Elder, was a Roman author, naturalist, and natural philosopher, as well as naval and army commander of the early Roman Empire, and personal friend of the emperor Vespasian...

 reported that "elephants are scared by the smallest squeal of the hog". Aelian

Aelian

Aelian or Aelianus may refer to:* Aelianus Tacticus, Greek military writer of the 2nd century, who lived in Rome* Casperius Aelianus, Praetorian Prefect, executed by Trajan...

 confirmed that elephants were frightened by squealing pigs (and rams with horns), and reported that the Romans exploited squealing pigs (and rams) to repel the war elephants of Pyrrhus

Pyrrhus of Epirus

Pyrrhus or Pyrrhos was a Greek general and statesman of the Hellenistic era. He was king of the Greek tribe of Molossians, of the royal Aeacid house , and later he became king of Epirus and Macedon . He was one of the strongest opponents of early Rome...

' elephants in 275 BC. Procopius

Procopius

Procopius of Caesarea was a prominent Byzantine scholar from Palestine. Accompanying the general Belisarius in the wars of the Emperor Justinian I, he became the principal historian of the 6th century, writing the Wars of Justinian, the Buildings of Justinian and the celebrated Secret History...

, in History of the Wars, records that the defenders of Edessa

Edessa, Mesopotamia

Edessa is the Greek name of an Aramaic town in northern Mesopotamia, as refounded by Seleucus I Nicator. For the modern history of the city, see Şanlıurfa.-Names:...

 suspended a squealing pig from the walls to frighten away Khosrau

Khosrau I

Khosrau I , also known as Anushiravan the Just or Anushirawan the Just Khosrau I (also called Chosroes I in classical sources, most commonly known in Persian as Anushirvan or Anushirwan, Persian: انوشيروان meaning the immortal soul), also known as Anushiravan the Just or Anushirawan the Just...

's single siege elephant in the sixth century AD.

Historical accounts of incendiary pigs or flaming pigs were recorded by the military writer Polyaenus

Polyaenus

Polyaenus or Polyenus vs. e]]; , "many proverbs") was a 2nd century Macedonian author, known best for his Stratagems in War , which has been preserved. The Suda calls him a rhetorician, and Polyaenus himself writes that he was accustomed to plead causes before the emperor...

 and by Aelian. Both writers reported that Antigonus II Gonatas

Antigonus II Gonatas

Antigonus II Gonatas was a powerful ruler who firmly established the Antigonid dynasty in Macedonia and acquired fame for his victory over the Gauls who had invaded the Balkans.-Birth and family:...

' siege of Megara

Megara

Megara is an ancient city in Attica, Greece. It lies in the northern section of the Isthmus of Corinth opposite the island of Salamis, which belonged to Megara in archaic times, before being taken by Athens. Megara was one of the four districts of Attica, embodied in the four mythic sons of King...

in 266 BC was broken when the Megarians doused some pigs with combustible pitch or resin, set them alight, and drove them towards the enemy's massed war elephants. The elephants bolted in terror from the flaming squealing pigs often killing great numbers of their own soldiers.