Battle of Cannae

Shortly after the start of the Second Punic War, Hannibal crossed into Italy by traversing the Pyrenees and the Alps during the summer and early autumn of 218 BC. He quickly won major victories over the Romans at Trebia and at Lake Trasimene. After these losses, the Romans appointed Quintus Fabius Maximus Verrucosus as dictator to deal with the threat. Fabius used attrition warfare against Hannibal, cutting off his supply lines and avoiding pitched battles. These tactics proved unpopular with the Romans who, as they recovered from the shock of Hannibal's victories, began to question the wisdom of the Fabian strategy, which had given the Carthaginian army a chance to regroup. The majority of Romans were eager to see a quick conclusion to the war. It was feared that, if Hannibal continued plundering Italy unopposed, Rome's allies might defect to the Carthaginian side for self-preservation. , Lake Trasimene and Cannae, anticlockwise, from top Therefore, when Fabius came to the end of his term, the Senate did not renew his dictatorial powers and command was given to consuls Gnaeus Servilius Geminus and Marcus Atilius Regulus. In 216 BC, when elections resumed, Gaius Terentius Varro and Lucius Aemilius Paullus were elected as consuls, placed in command of a newly raised army of unprecedented size and directed to engage Hannibal. Polybius wrote: Estimates of Roman troop numbers Rome typically employed four legions each year, each consisting of 4,000 foot soldiers and 200 cavalry. Per contemporary Roman sources, for the first time ever the Senate introduced eight legions, each consisting of 5,000 foot soldiers and 300 cavalry, with allied troops numbering the same number of foot soldiers but 900 cavalry per legion—more than triple the legion numbers. Eight legions—some 40,000 Roman soldiers and an estimated 2,400 cavalry—formed the core of this massive new army. Livy quotes one source stating the Romans added only 10,000 men to their usual army. == Roman command ==

The two consuls were each assigned two of the four legions to command, unusually employing all four legions at once on the same assignment. However, the Senate feared a real threat, and deployed not just four legions to the field but all eight, including allies. Ordinarily, each of the two consuls would command his own portion of the army, but since the two armies were combined into one, Roman law required them to alternate their command on a daily basis. The traditional account puts Varro in command on the day of the battle, and much of the blame for the defeat has been laid on his shoulders. His low social origins seem to be exaggerated in the sources, and Varro may have been made a scapegoat by the aristocratic establishment. He lacked the powerful descendants that Paullus had, descendants who were willing and able to protect his reputation—most notably his grandson Scipio Aemilianus, the patron of Polybius, one of the main sources of this history. == Prelude ==

In the spring of 216 BC, Hannibal took the initiative and seized the large supply depot at Cannae, in the Apulian plain, placing himself between the Romans and their crucial source of supply. As Polybius noted, the capture of Cannae "caused great commotion in the Roman army; for it was not only the loss of the place and the stores in it that distressed them, but the fact that it commanded the surrounding district". The two armies stayed in their respective locations for two days. During the second day (August 1) Hannibal, aware that Varro would be in command the following day, left his camp and offered battle, but Paullus refused. When his request was rejected, Hannibal, recognizing the importance of water from the Aufidus to the Roman troops, sent his cavalry to the smaller Roman camp to harass water-bearing soldiers that were found outside the camp fortifications. According to Polybius, On the morning of the battle, as the forces drew up, a Carthaginian officer named Gisgo reportedly remarked to Hannibal that the size of the Roman army was astonishing. "There is one thing, Gisgo, yet more astonishing", Hannibal coolly replied, "which you take no notice of." He then explained, "In all those great numbers before us, there is not one man called Gisgo", provoking laughter that spread through the Carthaginian ranks. Appian and Livy say Hannibal sent a small contingent of 500–600 mercenaries to pretend to desert to the Roman side. Those men, Celtiberians according to Appian and Numidians according to Livy, handed their weapons to the Romans as a sign of good will while retaining hidden short swords in their clothes. Once the battle started, following Hannibal's plans, the mercenaries attacked, stealing weapons and shields from their victims and causing chaos and confusion in the Roman camp. However, the veracity of this part is disputed. == Date ==

Ancient historians rarely provide the precise dates for the events they describe. For example, Livy provides no explicit dates for any of the battles of the Second Punic War. Macrobius, citing the Roman annalist Quintus Claudius Quadrigarius, states the battle was fought , or 2 August. The months of the pre-Julian Roman calendar are known not to correspond to its namesake Julian day. For example, Livy records a lunar eclipse in 168 BC as occurring on 4 September, when astronomical calculations show it happened on Julian day 21 June of that year. This discrepancy arose from the failure of the pontifices to properly perform intercalations, either by accident or for political advantage. A review of the evidence led P. S. Derow to identify the equivalent Julian date as 1 July 216 BC. Other authorities have suggested other Julian dates. == Armies ==

Figures for troops involved in ancient battles are often unreliable, and Cannae is no exception. They should be treated with caution, especially those for the Carthaginian side. The Carthaginian army was a combination of warriors from numerous regions, and may have numbered between 40,000 and 50,000. Their infantry comprised an estimated 8,000 Libyans, 5,500 Gaetulian, 16,000 Gauls, mainly Boii and Insubres (8,000 were left at camp the day of battle) and 8,000 of several tribes of Hispania, including Iberians, Celtiberians and Lusitanians. Hannibal's cavalry also came from diverse backgrounds. He commanded 4,000 Numidian, 2,000 Iberian peninsular, 4,000 Gallic and 450 Libyan-Phoenician cavalry. Hannibal had an auxiliary skirmisher contingent consisting of 1,000–2,000 Balearic slingers and 6,000 mixed-nationality javelinmen, possibly including Lusitanians among them. The uniting factor for the Carthaginian army was the personal tie each group had with Hannibal. == Equipment ==

, famous for the skill of their slingers Rome's forces used typical Roman equipment including (heavy javelins) and (thrusting spears) as weapons as well as traditional bronze helmets, bodyshields and body armor. In contrast, the Carthaginian army used a variety of equipment. The Iberians fought with , while Celtiberians and Lusitanians used straight , as well as javelins and various types of spears. For defense, warriors from Hispania carried large oval shields and often wore a crested helmet made of animal sinews. Most Gallic foot warriors likely had no protection other than large shields, and the typical Gallic weapon was a long slashing sword. The Numidian cavalry were very lightly equipped, lacking saddles and bridles for their horses, and wearing no armor but carrying small shields, javelins and possibly a knife or a longer blade. In contrast, the heavier Iberian peninsular cavalry carried round shields, swords, javelins and thrusting spears. The similarly heavy Gallic cavalry added the four-horned saddle, with the wealthier ones being clad in mail, a Gallic invention. Skirmishers acting as light infantry carried either slings or javelins. The Balearic slingers, who were famous for their accuracy, carried short, medium and long slings used to cast stones or bullets. They may have carried a small shield or simple leather pelt on their arms, but this is uncertain. Hannibal himself, like many Roman officers on the opposing side, might have been wearing a bronze and carrying a as his personal sidearm. The equipment of the Libyan line infantry has been much debated. Duncan Head has argued in favor of short stabbing spears. Polybius states that the Libyans fought with equipment taken from previously defeated Romans. It is unclear whether he meant only shields and armor or offensive weapons as well, though a general reading suggests he meant the whole panoply of arms and armor, and even tactical organization. Apart from his description of the battle itself, when later discussing the subject of the Roman legion versus the Greek phalanx, Polybius says that "...against Hannibal, the defeats they suffered had nothing to do with weapons or formations" because "Hannibal himself... discarded the equipment with which he had started out [and] armed his troops with Roman weapons". This has been disputed by Head, because Plutarch states they carried spears shorter than the Roman and by Daly because they could not have carried an unwieldy pike at the same time as a heavy Roman-style shield. == Tactical deployment ==

The conventional deployment for armies of the time was placement of infantry in the center, with the cavalry in two flanking wings. The Romans followed this convention fairly closely, but chose extra depth rather than breadth for the infantry in hopes of breaking quickly through the center of Hannibal's line. Varro knew how the Roman infantry had managed to penetrate Hannibal's center at Trebia, and he planned to recreate this on an even greater scale. The were stationed immediately behind the , ready to push forward at first contact to ensure the Romans presented a unified front. As Polybius wrote, "the maniples were nearer each other, or the intervals were decreased... and the maniples showed more depth than front". Even though they outnumbered the Carthaginians, this depth-oriented deployment meant that the Roman lines had a front of roughly equal size to their numerically inferior opponents. The typical style of Roman warfare was to continuously push with the infantry in the center and attempt to overpower the enemy line. Despite what these tactics might suggest, the center was not commanded by either of the two consuls, but by Geminus Servilius. The consuls commanded the two wings, Terentius Varro the left and Aemilius Paullus the right. Hannibal understood that the Romans fought their battles like this, and he took his outnumbered army and strategically placed them around the enemy to win a tactical victory. Hannibal had deployed his forces based on the particular fighting qualities of each unit, taking into consideration both their strengths and weaknesses. This aspect of Hannibal's leadership was highlighted in the use of a Spanish unit, the Balearic slingers, whom he placed behind the infantry to hurl their ranged missiles into the masses of Roman troops. He placed his Iberians, Celtiberians and Gauls in the middle, alternating the ethnic composition between Hispanics and Gauls across the front line, with himself at the front and center alongside his brother Mago. Roman sources claim their placement was chosen for being the most expendable and unreliable troops, but modern reflections believe those forces were actually selected for their battle-hardening to carry the weight of the Punic side, as they would be tasked with the controlled retreat that ultimately made possible Hannibal's pincer movement. Meanwhile, infantry from Punic Africa was on the wings at the very edge of his infantry line. This infantry would remain cohesive and attack the Roman flanks. Hasdrubal led the Hispanic and Gallic cavalry on the left (south near the river Aufidus) of the Carthaginian army. By placing the flank of his army on the Aufidus, Hannibal prevented this flank from being overlapped by the more numerous Romans. Hasdrubal was given 6,000–7,000 cavalry, and Hanno had 3,000–4,000 Numidians on the right. Hannibal intended that his cavalry, comprising mainly medium Hispanic cavalry and Numidian light horse, and positioned on the flanks, would defeat the weaker Roman cavalry and swing around to attack the Roman infantry from the rear as it pressed upon Hannibal's weakened center. His veteran African troops would then press in from the flanks at the crucial moment, and encircle the overextended Romans. The Romans were in front of the hill leading to Cannae and hemmed in on their right flank by the river Aufidus, so that their left flank was the only viable means of retreat. In addition, the Carthaginian forces had maneuvered so that the Romans would face east. Not only would the morning sun shine low into the Romans' eyes, but the southeasterly winds would blow sand and dust into their faces as they approached the battlefield. Hannibal's deployment of his army, based on his perception of the terrain and understanding of the capabilities of his troops, proved decisive. == Battle ==

As the armies advanced on one another, Hannibal gradually extended the center of his line, as Polybius described: "After thus drawing up his whole army in a straight line, he took the central companies of Hispanics and Celts and advanced with them, keeping the rest of them in contact with these companies, but gradually falling off, so as to produce a crescent-shaped formation, the line of the flanking companies growing thinner as it was prolonged, his object being to employ the Africans as a reserve force and to begin the action with the Hispanics and Celts." Polybius described the weak Carthaginian center as deployed in a crescent, curving out toward the Romans in the middle with the African troops on their flanks in echelon formation. At this decisive point, Hannibal ordered his African infantry to turn inwards and advance against the Roman flanks, creating an encirclement in one of the earliest known examples of a pincer movement. When the Carthaginian cavalry attacked the Romans in the rear and the African flanking echelons assailed them on their right and left, the advance of the Roman infantry was brought to an abrupt halt. The Romans were henceforth enclosed in a pocket with no means of escape. The Carthaginians created a wall and began to systematically massacre them. Polybius wrote: "as their outer ranks were continually cut down, and the survivors forced to pull back and huddle together, they were finally all killed where they stood." As Livy described, "So many thousands of Romans were dying... Some, whom their wounds, pinched by the morning cold, had roused, as they were rising up, covered with blood, from the midst of the heaps of slain, were overpowered by the enemy. Some were found with their heads plunged into the earth, which they had excavated; having thus, as it appeared, made pits for themselves, and having suffocated themselves." Victor Davis Hanson claims that nearly six hundred legionaries were slaughtered each minute until darkness brought an end to the bloodletting. A few Romans managed to escape the disaster. Both Livy and Polybius agree that the consul Varro managed to escape with 70 horsemen to Venusia. However, both authorities differ about how many more escaped. Polybius states "perhaps 3,000" infantry and 300 allied horsemen escaped, but his surviving narrative furnishes no further details. Livy is more informative. He singles out a group of 600 men under Publius Sempronius Tuditanus who fought their way out of the smaller encampment to the larger one, then from there to Canusium. The tribune Gaius Octavius was noted to be fighting along with Tuditanus in that breakout. Another group from the larger camp, numbering 4,000 infantry and 200 horsemen, also made their way to Canusium "some marching in column, others, which was no more dangerous, making their way over the countryside." Livy mentions that Varro reported to the Senate that he assembled a force of 10,000 survivors, "bits and pieces from various units, and nothing like a coherent force". == Casualties ==

Roman Polybius writes that of the Roman and allied infantry, 70,000 were killed, 10,000 captured, and "perhaps" 3,000 survived. He also reports that of the 6,000 Roman and allied cavalry, only 370 survived. Livy wrote, "Forty-five thousand and five hundred foot, two thousand seven hundred horse, there being an equal number of citizens and allies, are said to have been slain." He also reports that 3,000 Roman and allied infantry and 1,500 Roman and allied cavalry were taken prisoner by the Carthaginians. In addition to the consul Paullus, Livy recorded that among the dead were 2 quaestors, 29 of the 48 military tribunes, some of consular rank, including the consul of the previous year, Gnaeus Servilius Geminus, and the former , Marcus Minucius Rufus, and 80 "senators or men who had held offices which would have given them the right to be elected to the Senate". Eutropius: "20 officers of consular and praetorian rank, 30 senators, and 300 others of noble descent, were taken or slain, as well as 40,000-foot-soldiers, and 3,500 horse". Some modern historians, while rejecting Polybius's figure as flawed, are willing to accept Livy's figure. Other historians have come up with far lower estimates. In 1891, Cantalupi proposed Roman losses of 10,500 to 16,000. Samuels in 1990 also regarded Livy's figure as far too high, on the grounds that the cavalry would have been inadequate to prevent the Roman infantry escaping to the rear. He doubts that Hannibal even wanted a high death toll, as much of the army consisted of Italians whom Hannibal hoped to win as allies. Micheal Clodfelter also doubts the casualties of the Romans, citing the scarcity and unreliability of ancient sources, with him expressing that "are we really supposed to believe that Hannibal's 50,000 Carthaginians slaughtered 48,000–70,000 Romans on a single afternoon on the field of Cannae, even if the battle did degenerate into a massacre in its final stages?". Carthaginian Livy recorded Hannibal's losses at "about 8,000 of his bravest men." Polybius reports 5,700 dead: 4,000 Gauls, 1,500 Hispanics and Africans, and 200 cavalry. == Aftermath ==

For a brief period, the Romans were in complete disarray. Their best armies in the peninsula had been destroyed, the few remnants severely demoralized, and the only remaining consul (Varro) completely discredited. As the story goes, Rome declared a national day of mourning as there was not a single person who was not either related to or acquainted with a person who had died. The Romans became so desperate that they resorted to human sacrifice, twice burying people alive at the Forum Boarium of Rome and abandoning an oversized baby in the Adriatic Sea (perhaps one of the last instances of human sacrifices by the Romans, apart from public executions of defeated enemies dedicated to Mars). pledged his support to Hannibal following the Carthaginian victory. Within just three campaign seasons (20 months), Rome had lost one-fifth (150,000) of the entire population of male citizens over 17 years of age. The morale effect of this victory was such that most of southern Italy joined Hannibal's cause. After Cannae, the Hellenistic southern provinces of Arpi, Salapia, and Uzentum, including the cities of Capua and Tarentum, two of the largest city-states in Italy, and other settlements of non-Latin origin such as Herdonia, revoked their allegiance to Rome and pledged their loyalty to Hannibal. As Livy noted, "How much more serious was the defeat of Cannae than those which preceded it, can be seen by the behavior of Rome's allies; before that fateful day, their loyalty remained unshaken, now it began to waver for the simple reason that they despaired of Roman power." Following the battle, Sicily's Greek cities rose in revolt against Roman political control. The Macedonian king, Philip V, pledged his support to Hannibal, initiating the First Macedonian War against Rome. The following year Hannibal secured an alliance with the new king Hieronymus of Syracuse, the only independent king left in Sicily. s of the Roman knights killed during the battle, statue by Sébastien Slodtz, 1704, Louvre Livy illustrates the state of Roman morale with two vivid anecdotes. The first concerns Hannibal's brother Mago, who had returned to Carthage with news of the victory. He reported to their senate that in several engagements with the Romans Hannibal had killed over 200,000 soldiers and taken 50,000 prisoner; of six commanders met in battle, two consuls and a Master of horse had been slain; and a number of Roman allies had gone over to the Carthaginians. Then Mago concluded his report by having a container of golden rings poured upon the council floor in front of the assembled senators. He explained that each ring belonged to one who had been slain in battle and had earned the ring through exceptional bravery. Livy notes that one unnamed authority stated the volume of jewelry amounted to three and one-half measures, only to add "it is generally and more credibly held that there was not more than one measure of them". The second concerns Lucius Caecilius Metellus and three other military tribunes, who had taken refuge at Canusium with other Roman refugees. Demoralized at the defeat, they discussed the possibility of setting sail overseas and finding employment as mercenaries for some foreign prince. Word of this meeting reached the young Publius Cornelius Scipio who, with only a few followers, burst into the room where the discussion was underway. Holding his naked sword over the heads of the wavering men, Scipio is reported to have cried: After the battle, the commander of the Numidian cavalry, Maharbal, urged Hannibal to seize the opportunity and march immediately on Rome. It is told that the latter's refusal caused Maharbal's exclamation: "Assuredly, no one man has been blessed with all God's gifts. You, Hannibal, know how to gain a victory; you do not know how to use it." So firm were these measures that the word "peace" was prohibited, mourning was limited to only 30 days, and public tears were prohibited even to women. While the scholars provide reasons not to march, a soldier, Field Marshal Bernard Montgomery, believed Maharbal was right; when a more powerful adversary is down, he must be dispatched. "Hannibal's single chance of winning the larger war was to begin marching his army towards Rome," O'Connell adds. "In the end it still would have been a long shot. But it was his only shot. Instead, Hannibal chose another route, and the war became only a matter of time." For the remainder of the war in Italy, the Romans did not amass large forces under one command against Hannibal; they used several independent armies, still outnumbering the Punic forces in numbers of soldiers. The war in Italy still had occasional battles, but was focused on taking strongpoints and constant fighting according to the Fabian strategy. This finally forced Hannibal with his shortage of manpower to retreat to Croton from where he was called to Africa for the final battle of Zama, where the Roman victory ended the war. == Historical significance ==

Effects on Roman military doctrine depicting Hannibal's victory at Cannae, an allusion to France's conflict with the Holy Roman Empire during the 16th century Cannae played a major role in shaping the military structure and tactical organization of the Republican army. At Cannae, the Roman infantry assumed a formation similar to the Greek phalanx. This left them vulnerable to Hannibal's tactic of double envelopment since their inability to maneuver independently from the mass of the army made it impossible for them to counter the strategic encirclement used by the Carthaginian cavalry. The laws of the Roman state requiring command to alternate between the two consuls restricted strategic consistency. In the years following Cannae, striking reforms were introduced to address these deficiencies. First, the Romans "articulated the phalanx, then divided it into columns, and finally split it up into a great number of small tactical bodies that were capable, now of closing together in a compact impenetrable union, now of changing the pattern with consummate flexibility, of separating one from the other and turning in this or that direction." For instance, at Ilipa and Zama, the were formed up well to the rear of the —a deployment that allowed a greater degree of mobility and maneuverability. The culminating result of this change marked the transition from the traditional manipular system to the cohort under Gaius Marius, as the basic infantry unit of the Roman army. In addition, a unified command came to be seen as a necessity. After various political experiments, Scipio Africanus was made general-in-chief of the Roman armies in Africa, and was assured this role for the duration of the war. This appointment may have violated the constitutional laws of the Roman Republic but, as Delbrück wrote, it "effected an internal transformation that increased her military potentiality enormously" while foreshadowing the decline of the Republic's political institutions. Furthermore, the battle exposed the limits of a citizen-militia army. Following Cannae, the Roman army gradually developed into a professional force. Status in military history Cannae is as famous for Hannibal's tactics as it is for the role it played in Roman history. Not only did Hannibal inflict a defeat on the Roman Republic in a manner unrepeated for over a century until the lesser-known Battle of Arausio, but the battle also has acquired a significant reputation in military history. As military historian Theodore Ayrault Dodge wrote: Will Durant wrote, "It was a supreme example of generalship, never bettered in history... and it set the lines of military tactics for 2,000 years". Hannibal's double envelopment at Cannae is often viewed as one of the greatest battlefield maneuvers in history, and is cited as the first successful use of the pincer movement within the Western world to be recorded in detail. Cannae model Apart from being one of the greatest defeats inflicted on Roman arms, Cannae represents the archetypal battle of annihilation, a strategy that has rarely succeeded since. As Dwight D. Eisenhower, the Supreme Commander of the Allied Expeditionary Force in World War II, wrote, "Every ground commander seeks the battle of annihilation; so far as conditions permit, he tries to duplicate in modern war the classic example of Cannae". "Cannae" has become a byword for military success, and the battle is studied in military academies around the world. The notion that an entire army could be encircled and annihilated within a single stroke led to a fascination among Western generals for centuries, including Frederick the Great and Helmuth von Moltke, who attempted to create their own "Cannae". Delbrück's seminal study of the battle influenced German military theorists, particularly Chief of the German General Staff Alfred von Schlieffen, whose "Schlieffen Plan" was inspired by Hannibal's double envelopment maneuver. Schlieffen believed that the "Cannae model" would continue to be applicable in maneuver warfare throughout the 20th century: Schlieffen later developed his own operational doctrine in a series of articles, many of which were translated and published in a work entitled Cannae. In 1991, General Norman Schwarzkopf Jr., commander of coalition forces in the Gulf War, cited Hannibal's triumph at Cannae as inspiration for the rapid and successful coalition operations during the conflict. == Historical sources ==

There are three main accounts of the battle, none of them contemporary. The closest is Polybius, who wrote his account 50 years after the battle. Livy wrote in the time of Augustus, and Appian later still. Appian's account describes events that have no relation with those of Livy and Polybius. Polybius portrays the battle as the nadir of Roman fortunes, perhaps to emphasise the subsequent Roman recovery—some historians contend that his casualty figures are exaggerated—"more symbolic than factual". Livy portrays the Senate in heroic terms and assigns blame for the Roman defeat to the low-born Varro. This lifts blame from the Roman soldiers, whom Livy idealizes. Scholars tend to discount Appian's account. The verdict of Philip Sabin—"a worthless farrago"—is typical. Although he has no connected narrative of the battle, Plutarch provides a number of details about Cannae in his Parallel Lives, specifically the essays "Fabius" and "Aemilius Paulus". Historian Martin Samuels has questioned whether it was in fact Varro in command on the day on the grounds that Paullus may have been in command on the right. The warm reception that Varro received after the battle from the Senate was in striking contrast to the savage criticism meted out to other commanders. Samuels doubts whether Varro would have been received with such warmth had he been in command. Gregory Daly notes that, in the Roman military, the right was always the place of command. He suggests that at the Battle of Zama Hannibal claimed to have fought Paullus at Cannae and concludes that it is impossible to be sure who was in command on the day. == Notes ==