W015 The Second Punic War: the whole conflict

The dispute over Saguntum and Roman–Carthaginian commitments in Iberia preceded Hannibal's invasion of Italy. His army's arrival across the Alps transformed the war, but the conflict could not be decided simply by reading a sequence of battles in Italy. Roman colonies, allies, fleets and the ability to replace armies sustained continued resistance after catastrophic defeats.

Roman action in Iberia, the recovery of rebellious Italian communities, the capture of Syracuse, and Scipio's invasion of Africa progressively changed Carthage's options. Hannibal returned to Africa and lost at Zama. The peace of 201 BC restricted Carthaginian military independence, imposed an indemnity and confirmed the loss of its Iberian power.

Command, forces and military problem

Campaign geography and operational plates

The Second Punic War across all its theaters

Italy, Iberia, Sicily and Africa were interacting theaters of one war. The full map helps the reader resist treating Hannibal's Italian campaign as the whole conflict. Major arrows are strategic summaries, and the date at Zama must be distinguished from the peace concluded in the following year.

Extended campaign study

The account below develops the operations and their interpretation. Reported numbers and reconstructed tactical details retain the uncertainties described in the dossier.

Hannibal Barca: A Character Study

It is appropriate at this point to pause the narrative and to draw the portrait of the figure whose strategic and tactical decisions would dominate the next sixteen years of Mediterranean history. What manner of man this Hannibal was, the ancient sources have left us in remarkable detail — and the modern student of his career remains continuously impressed by the consistency with which the sources, hostile and friendly alike, describe him.

Polybius, writing seventy years after Hannibal's death and with no political stake in his memory, devotes a substantial portion of his Book 9 to a character study (Polybius 9.22–26) that may stand as the foundation of all subsequent treatments. Polybius's Hannibal is a man of exceptional physical hardiness — he could sleep on the ground wrapped in his cloak, indistinguishable from his soldiers; he could fast or eat as the campaign required; he was indifferent to heat and cold and weather — combined with an intellectual capacity for strategic synthesis that was, in Polybius's view, surpassed by no commander of the age. He spoke at least four languages fluently (Punic, Greek, Latin, and Iberian), he had been educated in Greek military theory by his tutor Sosylus of Lacedaemon, and he commanded the loyalty of armies of mixed national composition (Carthaginian, Iberian, Celtic, Numidian, Italian after 218) by personal example and by what every source agrees was an unusual sensitivity to the cultural and psychological particularity of each contingent under his command. His tactical instincts were the keenest of any commander in the period; his strategic vision was matched, perhaps, only by Pyrrhus before him and by Scipio Africanus after; his patience with long-term political objectives, and his capacity for absorbing reversals without losing strategic orientation, exceeded both of these.

The ancient tradition records, alongside the admiration, certain criticisms. Hannibal was, according to the Roman sources (chiefly Livy 21.4), capable of perfidia punica — Punic faithlessness, the breaking of treaty obligations when strategic advantage required — and crudelitas in the conduct of war, including the massacre of populations and the torture of prisoners. The Roman charges are coloured by the propaganda needs of the war and by the cultural antipathy of Roman to Carthaginian; modern scholarship generally treats them with skepticism. What is fair to say is that Hannibal conducted war by the standards of his time and his cultural background, which did not preclude harsh measures when strategic objectives required them but did not particularly favor cruelty for its own sake.

His treatment of Roman prisoners was unusual for its political calculation: Roman citizens were ransomed back to Rome on terms designed to maximize political pressure; Italian allies were released without ransom in an effort to detach them from the Roman alliance system. The strategy was sophisticated and was not based on cruelty.

In one further dimension Hannibal must be understood. His commitment to the war against Rome was not a personal hatred — though the Roman tradition liked to imagine it as such — but a strategic and political analysis that had been formed in him over twenty years of close observation of Roman conduct from the Spanish vantage point. He had grown up watching Roman opportunistic acquisitions (the seizure of Sardinia, the Ebro Treaty's ambiguous terms, the steady extension of Roman power in the western Mediterranean) and had concluded that the Carthaginian state could not coexist with the Roman state as currently configured. Either Rome would be defeated and contained, or Carthage would eventually be destroyed. The choice was clear; the only question was whether the means to defeat Rome could be assembled. Hannibal's career was the answer to that question, and his judgment that the means could be assembled was, by the standards of the time and the strategic calculus available to him, defensible. He was, in the end, wrong; but his being wrong required a level of Roman institutional resilience that no Mediterranean power of the prior history had possessed, and Hannibal's strategic calculation was reasonable to the extent that it underestimated this resilience.

The Saguntum Crisis (220–219 BC)

Saguntum (modern Sagunto, in the Valencian region of Spain) was a small Iberian city of perhaps twenty thousand inhabitants, located on the Spanish east coast about a hundred and twenty miles south of the Ebro river. It had been an ally of Rome since approximately 226 BC, the alliance having been concluded as part of the diplomatic activity surrounding the negotiation of the Ebro Treaty. Its strategic position was anomalous: it lay clearly south of the Ebro, within the territory the Ebro Treaty had reserved for Carthaginian expansion, and yet it had been brought into Roman alliance during precisely the period when the Carthaginian sphere of influence in Spain was being recognized. The anomaly is partly explained by the political circumstances of 226: the Romans were primarily concerned with the Cisalpine Gallic threat that would culminate at Telamon and were focused on negotiating Spanish stability for as long as that threat was active; they accepted the Saguntine alliance principally as a diplomatic counter-weight to Hasdrubal's growing power, not because they expected the alliance to have substantial military implications.

By 220 BC the situation had changed. The Cisalpine threat had been resolved at Telamon and the follow-up campaigns; the Roman strategic capacity in the central Mediterranean was now greater than it had been since the Punic War's end; and Hannibal's accession to the Spanish command had introduced a new factor — an aggressive Carthaginian leader whose long-term intentions toward Rome were uncertain but were, by the consensus of the Roman senatorial class, likely to be hostile. The Saguntine alliance, which had been a low-cost diplomatic gesture in 226, was now a potential trigger for war.

The crisis was precipitated by Saguntum itself. In 220 BC, the Saguntine government — supported by the Roman embassies that periodically visited the city — pursued an aggressive policy toward neighboring Iberian tribes that were within the Barcid sphere of influence. Border conflicts, the deposition of Saguntine-aligned tribal leaders by Carthaginian-aligned competitors, and several documented Saguntine raids against Carthaginian-protected territories produced a steady accumulation of grievances on the Carthaginian side. Hannibal, after consulting with the home government and (according to some accounts) waiting until the diplomatic situation was clear, undertook in the late spring of 219 BC a direct military operation against Saguntum.

The siege of Saguntum lasted approximately eight months, from the spring through the autumn and winter of 219 BC. The Saguntines defended their city with notable courage; their walls were strongly built; their position was reasonable from the standpoint of defense. The Carthaginian siege was conducted with the technical skill that the Barcid army had developed in years of Iberian campaigning: rams against the walls, mining and counter-mining, escalades from belfries, the use of pickets and supply control to prevent any external relief from reaching the city. Hannibal himself was wounded at some point during the siege (a thrown javelin through the thigh by Polybius's account) but recovered and continued the operation.

Throughout the siege, the Saguntines appealed repeatedly to Rome for relief. Roman embassies were dispatched to Hannibal's camp and to Carthage demanding the suspension of the siege; Hannibal received the embassies courteously but declined to suspend the siege, arguing (with a legal sophistication that the Roman tradition has somewhat obscured) that the Saguntine aggressions had themselves been provocative and that the operation was a legitimate Carthaginian response to violations of treaty obligations. The Roman embassies to Carthage demanded that the home government order Hannibal to withdraw; the Carthaginian Senate, after debate, refused. The Carthaginian government's refusal was understood in Rome as a state-level commitment to the Barcid position and as effective Carthaginian responsibility for Hannibal's conduct.

In the late autumn of 219 BC, with the city's defenses crumbling and external relief impossible, the Saguntine leaders made the decision that became the dramatic centerpiece of the Roman tradition of the event: they gathered the city's accumulated wealth into a public bonfire, killed their own families to prevent enslavement, and then either died defending the walls or threw themselves into the flames. When Hannibal's troops finally entered the city, they found it largely a charnel-house, with the bulk of the population already dead by their own hand and the survivors in no condition to be sold profitably as slaves.

The siege of Saguntum thus ended in the worst possible political outcome from the Carthaginian perspective: Hannibal had taken the city but gained no significant booty (the wealth having been burned), had eliminated a population that could not be exploited (most of it dead), and had given the Roman state a casus belli of unanswerable moral force (the Saguntines as Roman allies, destroyed for their loyalty to Rome). The dramatic potential of the story was substantial, and the Roman tradition exploited it in the manner one would expect.

The Roman Declaration of War (Spring 218 BC)

The Roman response was deliberate and proceeded according to careful diplomatic forms. In the spring of 218 BC, a senatorial embassy under Quintus Fabius Maximus (the man who would shortly become Cunctator, the Delayer, against Hannibal) traveled to Carthage with a formal ultimatum. The choice presented to the Carthaginian Senate was binary: either surrender Hannibal himself to Roman justice, or accept a state of war with Rome.

The famous scene of Fabius in the Carthaginian Senate House is preserved in detail in Livy (21.18) and in Polybius (3.20–21). Fabius, after delivering the Roman demand for the surrender of Hannibal, was reportedly asked by the Carthaginian senators what answer he wished to receive. He responded by holding up the front fold of his toga and saying that he carried in it both peace and war, and that the Carthaginians could choose which one to have. The Carthaginians, after some discussion, told him to let fall whichever the Romans preferred. Fabius dropped the fold and let war fall. The Senate of Carthage accepted the war.

The historicity of the dramatic toga-fold gesture has been doubted by some modern scholars but the substance is firm: a Roman ultimatum was delivered in the spring of 218, the Carthaginian Senate refused to surrender Hannibal, and a state of war was formally declared. The strategic situation that now obtained — with Roman armies and fleets being prepared for operations in Spain and Africa, and with Hannibal in Spain receiving the news of the war declaration and beginning his preparations for what would prove the most audacious operational decision of the entire period — would shortly resolve itself into the campaign that would carry Hannibal across the Alps and into Italy.

The Strategic Decision: To Go to Italy by Land

The Roman strategic conception for the war of 218 was straightforward and conventional. Two consular armies would be put in the field: one under the consul Publius Cornelius Scipio (father of the future Africanus) would proceed to Spain to engage Hannibal in his own theater; the other under Tiberius Sempronius Longus would cross to Sicily and prepare for an invasion of Africa. The strategic objective was to defeat Carthage where she was strong by the application of overwhelming Roman naval and military force; Italy itself was expected to remain a quiet rear area, providing manpower and supplies but seeing no major operations.

Hannibal's strategic conception was the precise opposite. The conventional war that the Roman Senate had planned would, by Hannibal's analysis, end in Carthaginian defeat. Roman naval superiority would prevent direct Carthaginian operations against Italy from the sea; Roman manpower and alliance-system depth would prevent any conventional Carthaginian gain from being permanent; the Carthaginian state's financial and demographic resources were inadequate to a war of attrition with Rome on the strategic geometry the Roman plan implied. The only path to Carthaginian victory was a war fought in Italy itself, with the Italian alliance system as the target — the dissolution of the Roman alliance, the detachment of the Italian socii from Rome, the reduction of the Roman state to its bare Roman-citizen base by the political destruction of the very institutional achievement of Book I's final chapters. If the alliance system could be broken, the Roman demographic and military advantage that had defeated Pyrrhus and that was now preparing to defeat Carthage on conventional lines would itself be broken; if the alliance system held, the war could not be won.

The strategic insight was correct in its identification of the Roman alliance system as the center of gravity. It was also correct in its identification of land-invasion of Italy as the only available means of attacking that center of gravity. What it underestimated was the institutional resilience of the Roman alliance system itself — the capacity of the relationship between Rome and her allies to survive even military defeats of unprecedented scale. The error was not visible in 218; it would become visible only after Cannae had been fought and the alliance had nevertheless not broken.

Hannibal's tactical solution to the strategic problem was the land march from Spain to Italy. The route was approximately a thousand miles by the path Hannibal selected (Carthago Nova to the Ebro, the Ebro crossing, the march along the southern coast of Gaul through the Massalian and Greek territories, the crossing of the Rhône, the ascent of the Alps, the descent into the Po valley). It would require the maintenance of an army's discipline and supply across hostile or uncertain territory over a march of perhaps five months. It would expose the army to the certainty of attrition from desertion, casualty, and the loss of equipment. It would deliver Hannibal into Italy with an army significantly smaller than the one he had begun the march with — a fact Hannibal himself accepted, calculating that the strategic effect of arriving unexpectedly in Italy would outweigh the operational cost.

The march was a calculated risk on a scale unparalleled in the prior strategic history of the Mediterranean. The closest analogue was Alexander's march from the Aegean to the Indus, but Alexander had marched with a supply system and a series of conquered cities behind him; Hannibal would march without rear support and through populations who were either neutral or hostile. If the march succeeded, the strategic advantage would be Carthaginian; if it failed, the war would be lost before it had really begun.

Outcome and critical assessment

Result and caution: Rome became the dominant western Mediterranean power. This was not the destruction of Carthage, which occurred in 146 BC. The traditional "218–202" battle chronology and "218–201" war chronology describe different endpoints. The three following dossiers are theater components of this record.

Historical record: IR-II, chapters 4–7; IR-III; Polybius, books 3 and 9–15; Livy, books 21–30.