Battle of the Trebia
|Battle of the Trebia|
|Part of the Second Punic War|
This map of the battlefield supports J. Wells' 1926 view that the Romans camped on the left bank and crossed to the right. This article adopts Mommsen's classic view that the Romans camped on the right bank and crossed to the left.
|Commanders and leaders|
|Hannibal||Tiberius Sempronius Longus|
(20,000 heavy infantry 10,000 cavalry, 37 war elephants)
(18,000 legionaries, 20,000 Italian allies, 4,000 cavalry)
|Casualties and losses|
|4,000–5,000 Infantry, Some Elephants||Approximately 26,000–28,000, up to 32,000 total casualties|
The Battle of the Trebia (or Trebbia) was the first major battle of the Second Punic War, fought between the Carthaginian forces of Hannibal and the Roman Republic in December of 218 BC, on or around the winter solstice. It was a resounding Roman defeat with heavy losses, and yet some 10,000 and more Romans, over 2.5 legions, were victorious on their part of the battlefield and retreated with honor to Placentia (Piacenza). In this battle Hannibal got the better of the Romans by exercising the careful and innovative planning for which he was famous. The impetuous and short-sighted opposing general, the consul Tiberius Sempronius Longus, allowed himself to be provoked into a frontal assault under physically difficult circumstances and failed to see that he was being led into a trap.
The battle took place in the flat country of the Province of Piacenza on the left bank of the Trebbia River, a shallow, braided stream, not far south from its confluence (from the south) with the Po river. The battle is named for the river. Although the precise location is not known for certain it is generally accepted as being visible from the Via Emilia, now paralleled by highway A21/E70 and a railroad trunk line, all of which come from Piacenza, a contemporaneously placed Roman colony (though perhaps on an existing settlement), and cross the river north of where the Romans did in the battle. The area is possibly in the comune of Rottofreno at its main settlement, San Nicolò a Trebbia, in the vicinity of the coordinates given at the head of this article.[note 1]
- 1 Sources and solutions
- 2 Prelude
- 3 Numbers
- 4 Battle
- 5 Aftermath
- 6 Military assessments
- 7 Notes
- 8 Sources
- 9 Bibliography
- 10 External links
Sources and solutions
The two main sources on the battle are the History of Rome by Livy (Book XXI) and Histories of Polybius (Book III). The two vary considerably in some of the geographical details and are ambiguous about some key points, especially whether the Romans were camped on the left bank or the right bank of the Trebbia and in which direction they crossed the river. Reconstruction of the disposition is the major scholarly concern regarding the battle. The sources all agree on the outcome.
Contending views stem from the confusion of real and hypothetical events, beginning with the supposed "union" of the two consular armies, which Sempronius had been ordered to effect. He was advancing "with all speed to join Publius." From the evidence, the supposed union amounted only to Sempronius having "many close conferences with Scipio, ascertaining the truth about what had occurred, and discussing the present situation with him."
Whether the union went any further is questionable. The two consuls maintained widely separated camps. Polybius assumes a union of troops would have been effected and Sempronius would be commanding four legions (he uses conditional language and not declarative statements). He explains how after the defeat Sempronius' army fell back on Placentia but neglects totally to say what happened to the wounded Scipio and how he got to Placentia. Livy, on the other hand, although repeating Polybius' numbers, states that after the battle Scipio quietly marched his army into Placentia and went on to Cremona so that there would not be two armies wintering in Placentia.
If Scipio's army were intact and quietly marched into Placentia, it is unlikely that either consul commanded any of the troops of the other nor did they assist one another in any way; in fact, there is no evidence that Sempronius informed Scipio he was going to attack. He is reported to have asked Scipio his advice on whether to attack and was strongly advised against it. There is no account at all of Scipio handing over any troops. If, as many authors suppose, Hannibal was trying to prevent a union, he seems singularly unaware of it. He made no move to stop Sempronius coming up from the east. The consuls themselves, however, each jealously guarded his own authority.
Starting with Polybius, some military writers throughout the centuries have assumed that because union was intended it was effected: this assumption leads to the problem known as "the Roman Camp." In fact there was not one camp, but two — Scipio's camp in the hills on the left bank and Sempronius' camp in the plains on the right bank. Neglect of this duality leaves the writers free to select either (or neither) as "the Roman Camp"; consequently, it appears now on the left bank, now on the right; now in the hills and now on the plain.[note 2]
Hannibal's perception of the non-union led him to the winning strategy. Provoking Tiberius to send his men wading through the chilled winter waters of the Trebbia during a precipitation of snow and rain, he attacked the Romans from ambush with his own rested, fed and warm men and killed 2/3 to 3/4 of them, driving the lucky ones back across the river to Placentia. The Romans, it is said, could scarcely lift their arms to defend themselves.
Arrival of Hannibal
Hannibal began the Second Punic War in 219 BC by attacking the Roman-allied city of Saguntum just north of what is now Valencia in Spain. After destroying the city, he marched on Italy, beginning with a force of approximately 102,000 men and a few dozen war elephants when he crossed the Ebro river in Spain, the previous border between Roman and Carthaginian interests. Trekking over the Alps the Carthaginian force made it through the mountains with staggering losses, being reduced to 26,000 emaciated men. Winning a completely unequal conflict against the Ligurians and the first legion-sized battle with the Romans at the river Ticinus, he had filled out his army with Gallic and other allies to the number of 90,000 men: 80,000 infantry and 10,000 cavalry, by the time of the Battle of Trebia. They were more than enough to be completely effective against the Romans; moreover, by that time Hannibal had turned all Gallia Cisalpina (the region in which the battle was fought) against the Romans, and the Carthaginians were prospering on enthusiastic Gallic supply and support.
Arrival of Sempronius Longus
The Roman Senate, appalled by the massacre of the Ligurians, had ordered the consul Tiberius Sempronius Longus, who was stationed in Sicily, to reinforce the existing Roman general, Publius Cornelius Scipio. Unknown to them now, Scipio had been wounded during the Battle of Ticinus and had been driven into the hills south of Piacenza, then Placentia, a contemporary colony of the Romans. The Gauls had turned against Rome now in favor of Hannibal over this very issue of colonization. Hannibal was camped in the plain below Scipio's camp, enjoying the favor of the Gauls. Placentia was not being occupied by either army.
Receiving the orders of the Senate at Lilybaeum in Sicily, Sempronius had dismissed his men after taking their oaths to reassemble at Ariminum south of the Po river. From there he probably marched along the route of the future Via Aemilia straight into Placentia.[note 3] Sempronius' two legions assembled probably in early December. It wasn't long before "Tiberius and his legions arrived and marched through the city." They did not stop there, probably because Hannibal's Numidian cavalry had burned the Roman fort, but camped outside it to the south, at or near Hannibal's previous camp, some 40 days after they had left Sicily. Apparently Hannibal had crossed the Trebbia in his pursuit of Scipio and was camped on its left bank.[note 4]
Capture of Clastidium
Despite Gallic willingness to supply Hannibal, he found that the size of his army was becoming a burden on the local communities resulting in a "daily increasing scarcity." The Romans had a grain storage depot at Clastidium (now Casteggio), which he was planning to attack. He must have bypassed it previously on his way to Placentia. Instead of attacking, he found that he could bribe the commander, Dasius Brundisius, whose name indicates he was not Roman but was from Brundisium, with 400 gold coins. The garrison was subsequently treated with kindness, which suggests that good treatment was part of the deal, but none of the sources describe it in detail.
Clastidium was located on the right bank of the Po upstream from the Trebbia. That Hannibal could operate there without hindrance indicates that he was in fact camped on the left bank of the Trebbia and subsequent operations against the Gauls prove it further.
Dissent among the Gauls
For reasons unstated by either author, the Carthaginians suspected treachery from the Gauls located between the Trebbia and the Po; that is, on the left bank of the Trebbia, where his subsequent activity shows that Hannibal was certainly located. The authors make it clear that the Gauls hoped to stay on the good side of both commanders but they do not give the details. Hannibal was incensed enough to dispatch 5,000 infantry and 1,000 cavalry to devastate their country, "district by district" and this action decided whose side they were to take. They appealed to the Romans.
Tiberius sent an unspecified number of cavalry across the river with 1,000 infantry. They caught the Carthaginians pillaging there and drove them into Hannibal's camp (clearly on the left bank). The Carthaginians acquired reinforcements and sallied out to push the Romans back across the river, where the Romans sent for reinforcements from their camp (proving a right-bank location). Hannibal stopped the Carthaginian attack because this was not the time and place of his choosing, but was happening spontaneously. Tiberius, however, concluded he had won a victory with the very arm in which Scipio had been beaten, the cavalry.
Hannibal now knew that he could provoke Tiberius and made plans to entice him across the river where his troops could be slaughtered without assistance from the camp.
The consuls confer
The cavalry action of the preceding day had inspired the Romans with confidence. Sempronius resolved to seek "a decisive battle as soon as possible." The Senate had sent him to assist Scipio, but the latter was unable to be assisted, leaving Sempronius in an ambiguous situation. According to Polybius, Sempronius felt free to act on his own: "He was, it is true, at liberty to act as he thought best owing to the illness of Scipio." Nevertheless he felt obliged to argue it out with his colleague in heated language: "What good is there in further delay and waste of time? Where is the third consul and the third army we are waiting for? ... it is from their native soil, from the land in which they were born, that the Romans are to be driven." He accuses the Romans of "cowering within their camp in the heart of Italy." Livy is unable to say, however, where this harangue took place, whether sitting "by his ailing comrade, or in the headquarters." There is no mention at all of the camp at Ripa Alta or how Scipio would have gotten to the camp near Placentia or whether Sempronius had any authority to command Scipio's men.
Wherever this consultation of consuls took place, Scipio advised "that their legions would be all the better for a winter's drilling, and that the notoriously fickle Celts would not remain loyal to the Carthaginians... he advised Sempronius to let matters remain as they were." Sempronius decided to ignore Scipio and go ahead with the attack. The texts do not say that he kept Scipio informed.
When Scipio left Massilia (Marseilles) he had no or minimal forces. In north Italy he superseded Lucius Manlius, acquiring his two legions plus 10,000 allied infantry and 1,000 cavalry (less losses inflicted by the Boii, at least 1,300), and Gaius Atilius, reacquiring the legion that had been taken from him by the Senate plus 5,000 allies. Since Livy is using 4,000 infantry and 300 cavalry as the standard complement of a legion, Scipio should have had 12,000 Roman infantry and 900 Roman cavalry plus maximum 13,700 allied infantry and 1,000 cavalry. After losses suffered at Ticinus, Scipio should have had at most 27,000 men.
Sempronius had been given two legions: 8,000 infantry and 600 cavalry, but he also had several thousand allies, about 16,000 infantry and 1,800 cavalry. Scipio had the greater army and would have been senior in command if active. Neither consul, however, could supersede the other without a decree from the Senate.
Livy states the actual number of Roman troops before the battle to have been 18,000 men, to which were added 20,000 Italic allies. Polybius sets the number at 16,000 and 20,000 allies, "this being the strength of their complete army for decisive operations, when the consuls chance to be united." He does not say that they were united, only that, if they were, these would be their numbers; that is, 4 Roman legions and 4 allied alae. Both authors subsequently tack on 4,000 cavalry, evidently not part of the 36,000 or 38,000, from which it may be inferred that the latter were infantry (a circumstance not stated by the authors).
The numbers stated to have fought the battle are problematic: a combined Roman army should have had 5 legions of 20,000 men and all 30,000 allies authorized by the Senate and yet if the armies were not combined Sempronius should have had only two legions of 8,000 men. One answer is that Scipio gave up two legions and kept one and 20,000 auxiliaries in his own camp as a reserve. Livy seems to think that Scipio's wound gave the entire authority to Sempronius, but immediately after the battle Scipio commanded an army marching from his camp to Placentia. If Scipio could command after the battle then he was not so incapacitated as to be removed from command before it. Both authors agreed that the two consuls had sharp differences of opinion and that Sempronius acted on his own.
It is possible that the authors doubled the number of Roman legions fighting the battle and that Sempronius had only 8,000 or 9,000 Roman infantry. The authors both relate, however, that a mass of 10,000 men broke out of the Carthaginian encirclement and fell back on Placentia. Tiberius apparently did have more than two legions. Scipio argues in the story that Sempronius' men needed the winter to train, suggesting that on the way to north Italy Sempronius may have raised two more legions of recruits, throwing them into battle under difficult physical circumstances against expert advice without training. There is no mention of any such events, however.
Yet another hypothesis for reconciling the numbers cited by Livy for combined strength of the two consular armies and the actual number of participants in the battle of the Trebia would be that Sempronius detached part of his allied contingents for garrison duty on Sicily and for naval service with Marcus Aemilius and Sextus Pomponius. Some allowance should also be made for non-combat losses. The strength of this hypothesis lies in the maximum use of ancient evidence.
The 10,000 veteran troops who did not break and run were the major survivors. The authors make it clear that not many of the others made it to Piacenza, but some did. The others were massacred, as was Hannibal's custom. They appear to have been the mysterious extra legions – perhaps recruits – the cavalry and the auxiliaries. The casualties therefore were a maximum of 32,000 men, a rate of 76%. The rate was not at maximum but the number who escaped is not known. If it was half the number who fell back in good order the rate would have been 64%, in either case a Roman disaster, but perhaps not quite the one depicted by the authors if Scipio's army was not involved. The Carthaginians did not cross the river to take Sempronius' camp. They might have been physically exhausted or concerned about the 10,000 or they could have been deterred by the army in the second camp on their flank.
Although Hannibal might have arrived at the Trebbia with as many as 90,000 men, both sources agree that he fought the battle with 40,000 men: 20,000 Celtic, Spanish and African heavy-armed infantry, 10,000 cavalry plus another 1,000 in ambush, 8,000 Balearic slingers and spearmen plus another 1,000 in ambush. While the casualties were not stated, the square of 10,000 Roman infantry that broke the Carthaginian center caused a "great slaughter" of African and Celtic troops. If Hannibal had another 50,000 troops in reserve, his capabilities would not have been seriously diminished.
The December of 218 BC was cold and snowy. Scipio was still recovering from his wounds but Sempronius was "impetuous and headstrong." Eager to come to blows with Hannibal before Scipio could recover and assume command– and especially as the time for the election of new consuls was drawing near–Sempronius took measures looking for a general engagement, disregarding Scipio's caution not to attack with untrained men. Unfortunately for Sempronius, Hannibal was aware of this, and prepared a plan to take advantage of Sempronius' impetuosity. Hannibal's force was camped across the cold and flooded Trebbia River. Polybius says (translator Paton),
He had long ago noticed a place between the two camps, flat indeed and treeless, but well adapted for an ambuscade, as it was traversed by a water-course with steep banks, densely overgrown with brambles and other thorny plants, and here he proposed to lay a stratagem to surprise the enemy.
Hannibal was relying on a network of Gallic spies to keep informed of enemy activity. When they told him the Romans were ready to do battle, he sent for 100 each of the best infantrymen and cavalrymen and had them select 10 each for a special mission. This detachment of 1,100 infantry and 1,100 cavalry under the command of Hannibal's younger brother, Mago, were instructed to conceal themselves in the underbrush of the above-mentioned water-course under the cover of night, and prepare an ambush for the Romans.[note 5]
On the following morning, Hannibal sent the rest of the Numidian cavalry beyond the Trebbia to harass the nearby Roman camp and retreat, so as to lure the Romans into a position from which Mago's hidden detachment could strike at the opportune moment. They rode up to the gates and discharged missiles at the men on duty. In response Sempronius sent out the Roman cavalry to drive them off, and shortly afterwards sent out 6,000 javelin-throwers, the light-armed infantry, to cover the formation of the main line of battle behind them. These were the 12,000 Roman heavy-armed infantry and 20,000 Italic allies, apparently heavy-armed also, as they were never used as light-armed infantry.
Roman crossing of the Trebia
Theodore Ayrault Dodge, a military historian, wrote of the battle:
The day was raw; snow was falling; the troops had not yet eaten their morning meal; yet, though they had been under arms for several hours, he pushed them across the fords of the Trebia, with the water breast-high and icy-cold. Arrived on the farther side, the Roman soldiers were so chilled that they could scarcely hold their weapons. Hannibal was ready to receive them. His men had eaten, rubbed themselves with oil before their camp-fires, and prepared their weapons. He might have attacked the Roman army when half of it was across, with even greater chances of success. But when he saw his ruse succeeding, he bethought him that he could produce a vastly greater moral effect on the new Gallic allies, as well as win a more decisive victory, by engaging the whole army on his own terms.
Hannibal's strengthening of flanks
Hannibal now put forward his 8,000 light infantry – javelin-throwers and Balearic slingers – as a covering skirmishing line, and behind them, he formed the main battle line of 20,000 infantry of Africans, Iberians, and Celts, with 10,000 cavalry and an unspecified number of elephants split between the two flanks.
The Numidian cavalry wheeled suddenly and attacked the Roman cavalry, strung out in pursuit. Sempronius withdrew them to the flanks. The Numidians then harassed the Roman light infantry screen, or velites, causing them to expend all their missiles. As the armies approached they were unable to be much of an impediment to the Carthaginians due to lack of ammunition and hypothermia, so Sempronius ordered them to fall back through the heavy infantry. Similarly, when the Balearic slingers and javelin-throwers began to encounter Roman heavy infantry, Hannibal withdrew them and placed them on the wings.
After the light-armed infantry (velites) retreated through the Roman line, the heavy-armed infantry (hastati and principes) closed with their Carthaginian counterparts. Concurrently the Carthaginian wings attacked the Roman wings, forcing them back to the river and leaving the infantry, whom they intended to protect, exposed. Samuels suggests that in describing the Roman cavalry as being a withdrawal he is being tactful and a rout better describes what happened. Seeing that the Roman rear had passed their position, Mago's hidden force emerged from the ambush and fell upon the rear of the hard-pressed Roman infantry. With their morale already sapped by cold, hunger and fatigue, the Romans on the sides and in the rear broke formation under this fresh onslaught and ran for the river. Although the sources do not say it, the retrograde movement suggests that the recruits, the least-trained men, had been placed in those positions, as Roman veterans generally did not run.
As the disorganized men were milling about the river, Hannibal used the opportunity to effect a massacre. The great majority of the casualties fell here or drowned in the river. The Roman cavalry escaped on horseback. As the Roman legionaries remained with Sempronius in the center and majority of the force were the 20,000 Italics, the men who died were probably not the core of the legionaries but were on the whole the Italic allies, who were as yet untrained and untested in battle.
Roman hollow square
It is clear from the odds and from subsequent events that Tiberius intended a main attack on the center of the Carthaginian line. As he was not killed on the flanks or in the rear, he must have been commanding the center in person. It would have included his most experienced and effective infantry. In fact they behaved as professional soldiers, some of them quickly wheeling to fill in the sides and rear, forming a hollow square. In this standard Roman infantry formation all sides faced outward leaving the center necessarily hollow, where the command post was and where the wounded were placed. This square soon deflected all Carthaginian attacks against it. The Carthaginians concentrated on the men by the river instead.
A light-infantry detachment was sent out to stop the elephants. These they dealt with by volleying darts and jabbing under the tail. The elephants became wild, attacking both sides, until Hannibal ordered them driven off to the left to attack the Gauls fighting for Rome. These must have been the Cenomani tribesmen, the only Gauls in that category. What Livy means by "the left" is not clear, but they cannot have been in the square and most perished.
Although he had made some unfortunate strategic decisions, Tiberius proved himself a better battlefield general, ordering his men forward against the Carthaginian center. The enemy there took great losses although the authors do not say what they were. Of the two ethnic groups, Africans and Celts, the latter are said to have lost the most men. The square soon found itself at the Carthaginian rear and looking back could see the Carthaginian army effecting a slaughter of allied troops. Tiberius did not return to their assistance – the sources offer his excuses of the river and the heavy rain – but marched his men into Piacenza, probably over a bridge that must have stood where the highway and railroad bridges now stand.
The positions of the combatants with regard to the battlefield's topographic features are as follows. Scipio first camped before Placentia with Hannibal 50 stadia (c. 9.3 kilometers, 5.8 miles) away on the right bank of the Trebbia. Then he crossed the Trebbia and marched south to camp at Ripa Alta (the first hills).[note 6] Hannibal camped 40 stadia (7.4 kilometers, 4.6 miles) away, and this was his camp during the battle. The location was probably near Gragnano Trebbiense on the Trebbia's left bank. If it had been on the right bank, Hannibal would have intercepted Sempronius and prevented him from camping near Scipio. But, that is what Sempronius did. Scipio was on the right bank; Sempronius on the left. When the Gauls came into Sempronius' camp to ask for help, Sempronius sent men across the Trebbia to drive the plunderers into Hannibal's camp.
The Roman start line was between Tiberius' camp and the Trebbia. The hollow square broke out on the left bank and were "prevented by the river" from their camp, so they went on to Placentia, followed by the other survivors. The problem is that Placentia lies on the opposite bank, on the same side as the camp, so that if the river was an obstacle in reaching the camp, it must have been an obstacle in reaching Placentia north of the camp. What is worse, Livy has Scipio in the same camp as Sempronius, crossing the river to enter Piacenza on the bank he had just left.
Either Sempronius' camp was on the left bank and all the narrative of events before the battle is wrong, or the description of the retreat is wrong. Both solutions (and more) have been proposed. Mommsen simply assumed that the square did recross the river, but closer to Placentia, perhaps on a bridge.[note 7] The colonists must have had bridges over both the Po and the Trebbia; however, this information has been left out of the story. If the Roman camp was on the left bank, then the early sequence is all wrong and one must presume even more information was omitted from the story.
The next night, according to Livy, "the camp garrison and the other survivors, mainly wounded men, crossed the Trebia on rafts." Scipio was in command. He "marched his army in perfect quiet to Placentia, whence he crossed the Po to Cremona, that a single colony might be spared the burden of two armies in winter quarters." In the single-camp interpretation of this passage Scipio must have crossed to the enemy side regardless of whether the camp was on the left or right bank. However, the narrative goes on to say that Hannibal did not cross the river to pursue them; thus, as previously, Scipio was placing the river between him and Hannibal. Following the thread of the previous narrative, Scipio must still have been in his camp at Ripa Alta. Some survivors managed to make their way upriver on the same side as the battle to Scipio's camp. Scipio broke camp at night, crossed the river and reached Placentia on the right bank, past Sempronius' now abandoned camp, or perhaps picking up the garrison left there along with additional survivors. He still had an army of such magnitude that it could not seek supplies in the same city as Sempronius'.
For a time the Romans were spared attacks by the Carthaginians, as the latter were now suffering from exposure. A cold snap had set in and the precipitation had turned from rain to snow and ice. All the elephants but one (or several in Polybius) died along with "many men and horses." When the news arrived at Rome that both consuls had been defeated at Ticinus and Trebbia the population panicked, expecting to see Hannibal at the gates. In fact the defeats were not the catastrophe they believed. Some 2.5 and more legions escaped from the battlefield, 3 more under Scipio never participated, while 2 more were in Spain; in all, the Senate still had 7.5 legions healthy and in good winter quarters.
By now the Carthaginians had recovered. Their cavalry isolated both cities, but these were easily supplied by boat up the Po. Sempronius evaded the enemy cavalry to return to Rome and conduct consular elections. The two new consuls elected were Gnaeus Servilius Geminus and Gaius Flaminius Nepos, the latter of whom would lead the Roman army during the debacle at Lake Trasimene. Meanwhile they were not scheduled to assume command until 15 March, the first day of the Roman year in 217 BC. Sempronius returned immediately to his command. The new consul-elects recruited more legions of Romans and allies, reinforced Sardinia and Sicily, placed garrisons at Tarentum and other places, built a fleet of 60 quinqueremes and established supply depots at Ariminum and Arretium in Etruria in preparation for marching north. They asked military assistance from Hiero, tyrant of Syracuse, and received 1500 men. Flaminius marched into winter camp at Arretium and Servilius at Ariminum.
Final operations around Placentia
The Romans had constructed a fortified outpost near Placentia, Emporium ("trading center"). Hannibal decided to test it by attacking at night with cavalry and light infantry, but the sentries were alert. They raised the camp, which shouted so loudly that it could be heard in Placentia. At dawn the next morning Sempronius' cavalry fell upon the Carthaginians, driving them off and wounding Hannibal slightly. Of this defense Livy uses the word "brilliant."
A few days later Hannibal marched on a supply depot at Victumviae (location unknown but probably Vigevano[note 8]) Its population had been enhanced by anti-Carthaginian refugees from all the Gallic tribes. Untrained, they went out to meet Hannibal as a mob of 35,000 and were shortly driven back into Victumviae, which arranged a formal surrender. As soon as the garrison had turned over its weapons Hannibal's men on signal ravaged the town, committing "every kind of outrage that lust, cruelty and brutal insolence could suggest."
For a time the "cold was intolerable" but as spring began to come on Hannibal resolved to attack Etruria following the Trebbia southward.[note 9] In the Apennines the army was struck by a thunderstorm of such intensity that they could not pitch camp and when rain turned to hail and snow they put the tents flat and crawled under them. The storm was followed by a cold snap. All the elephants except one, and many of the horses died. After two days Hannibal returned to the Placentia region and camped. Sempronius, in the last of his term as consul, determined to do battle, left Placentia and camped three miles from Hannibal.
Hannibal was down to 12,000 infantry and 5,000 cavalry, perhaps not from casualties, more likely because his army, relying on Gallic allies, was seasonal. Marching the next morning to Tiberius' camp, he was met by the Romans, who drove him back on his camp and then attacked it. Putting the bulk of his men in the center, Hannibal waited for the Roman to break in, but they never managed to do so. When they began to leave at the end of the day Hannibal sallied out in force to attack the Roman rear, hoping to effect a massacre. The fall of night prevented that event. Casualties were equal on both sides. This was the last military engagement of the consular year, a year of defeats, but perhaps not disastrous, as the next year would be.
Three great errors Sempronius committed, of which every one deserved to be recompensed with the loss that followed. The first was, that he fought with Hannibal in a champain, being by far inferior in horse, and withal thereby subject to the African elephants, which in enclosed or uneven grounds, and woodlands, would have been of no use. His second error was, that he made no discovery of the place upon which he fought, whereby he was grossly overreached, and ensnared, by the ambush which Hannibal had laid for him. The third was, that he drenched his footmen with empty stomachs, in the river of Trebia, even in a most cold and frosty day, whereby in effect they lost the use of their limbs.
- Over the course of more than two millennia the precise configuration of the Trebbia and its streams as well as that of the Po have changed geologically. Although the location of Placentia is believed to be roughly the same, the original surfaces are under new layers of sediment and the locations of the bends, the depths and widths of the streams all have changed. Construction in the area also has been extensive, not to mention the turning over of the soil and obliteration of features by heavy bombing when the bridges and rail lines were destroyed in World War II. The Trebbia and the Po are currently heavily diked. Naiman, Robert J; H. Decamps (1990). The Ecology and Management of Aquatic-Terrestrial Ecotones (illustrated ed.). Taylor & Francis. pp. 142–143. ISBN 978-1-85070-271-9.
- The location of the battle would be a historical asset to communities that might claim it, leading to some claims that as far as the evidence is concerned might be considered outrageously different. Some encyclopedic sources list Bobbio in the Apennines, many miles upstream from Placentia, and accessible from Placentia along the river only through steep ravines. Both Livy and Polybius place the battle within a few hours by foot of Placentia and in flat country. A presentation of the problems of the number and locations of the camps can be found in Smith, William (1873). "Trebia". A dictionary of Greek and Roman geography 2. J. Murray.
- With regard to the problem of how Sempronius coming from Ariminum could have effected Livy's union with Scipio on the Trebbia's left bank if Hannibal was on the right bank, Georg Niehbur discards the Ariminum passage and conjectures that Sempronius came through Liguria. Niebuhr, Barthold Georg; Leonhard Schmitz (ed. and tr.) (1844). "Lecture LXI". Lectures on the History of Rome, from the First Punic War to the Death of Constantine II (2 ed.). London: Taylor and Walton. p. 94. "It is inconceivable how the two consuls could join each other; Sempronius must have marched through Liguria by way of Genoa."
- Niebuhr, p. 94, a left-to-right theorist, keeps Hannibal on the right bank with an additional speculation: "We must suppose that Hannibal was on the eastern bank of the Trebia: the Romans cross the river to offer battle, consequently Hannibal, who was on the right bank of this river, must have crossed the Po somewhat below Placentia." This opinion ignores the crossing upstream from Placentia, stated by both sources.
- The location of the water-course depends on one's interpretation of the disposition of troops. Dodge (p. 268), who espouses the left-to-right theory, and places the Carthaginian camp before Piacenza, sees the water-course as being the upper Trebiola, a right-bank tributary of the Po entering it downstream from that city. In the right-to-left theory it must have been (and possibly still is in some form) on the left bank of the Trebbia.
- Lancel and Nevill cite Scipio's crossing of the Trebbia and encampment in the hills but then adopt Kromayer's view that the camp was at Pieve-Dugliara, a community on the right bank in the plain. Lancel, Serge; Antonia Nevill (Translator) (1999). Hannibal (Reprint, illustrated ed.). Wiley-Blackwell. p. 85. ISBN 978-0-631-21848-7. "Since the already old, but decisive, work of Kromayer (1912, p. 48), this second camp of Scipio has been taken to be situated at Pieve-Dugliara, very near Rivergaro, ..."
- Grundy recapitulates the argument, quoting Mommsen as follows: "If Placentia lay on the right bank ... and if the battle was fought on the left bank, while the Roman encampment was pitched upon the right ... the Roman soldiers must certainly have passed the Trebbia in order to gain Placentia, as well as to gain their camp ... it may even have been the case, although it cannot be proved, that a bridge led over the Trebbia at that point (i.e. near Placentia) ..."
- Vigevano as Victumulae is just north of the probable site of the Battle of Ticinus. Scipio had not chosen to camp there but escaped instead to Placentia, perhaps because more secure. Prevas, John (2001). Hannibal Crosses the Alps: The Invasion of Italy and the Punic Wars (illustrated ed.). Da Capo Press. p. 185. ISBN 978-0-306-81070-1.
- In this part of the account Livy becomes especially self-contradictory. Consequently the Cambridge Ancient History asserts that the attempted Apennine crossing and battle with Sempronius are to be rejected. A. E. Astin; John Boardman; F. W. Walbank; M. W. Frederiksen (1989). The Cambridge ancient history VIII (2, illustrated, revised ed.). Cambridge University Press. p. 49. ISBN 978-0-521-23448-1.
- Polybius III.68.
- Smith, Reginald Bosworth (1885). Rome and Carthage: the Punic Wars. New York: Charles Scribner's Sons. pp. 128–129. "Why Hannibal did not seize what seems to have been a golden opportunity, and, thrusting himself between the two armies, crush Sempronius as he crossed the level country, so favorable for cavalry, between Ariminum and the Trebbia, must remain a mystery."
- Livy XXI.48.
- Livy XXI.52.
- Polybius says 2,000 infantry and 1,000 cavalry, III.69.
- Grundy (1896) p. 95.
- Polybius III.70.
- Livy XXI.53.
- Livy XXI.17
- Livy XXI.25
- Livy XXI.26
- Livy XXI.55.
- Polybius III.72.
- Livy XXI.51
- Livy XXI.54–55.
- Polybius III.71.
- Livy XXI.53–54.
- Livy XXI.54.
- Dodge (1891) pp. 268–269.
- Polybius III.72–74, Livy XXI.55.
- Samuels, M. "The Reality of Cannae", Militargeschichtliche Mitteilungen, 1990, p. 21.
- MacDougall, Patrick Leonard, Lieutenant Colonel, Commandant of the Staff College (1858). The Campaigns of Hannibal. London: Longman, Brown, Green, Longmans, & Roberts. p. 51. "The bravery and discipline of the Roman infantry, which broke through the enemy and marched clear off the field to Placentia, were admirable."
- Dodge (1891), p. 271, "...Sempronius, who if not a discreet general, showed himself a doughty fighter."
- Polybius III.66.
- Polybius III.69.
- Grundy (1896) page 91.
- Livy XXI.56.
- Livy XXI.57.
- Livy XXI.58.
- Polybius, Histories, Book III, 74
- Raleigh, Walter; William Oldys, Thomas Birch (Contributors) (1829). The Works of Sir Walter Ralegh, Kt; Now First Collected: to which are Prefixed The Lives of the Author. VI. The History of the World. Book V. Chap. 1–3. Oxford: University Press. p. 242.
- Cottrell, Leonard (1992). "12. The Battle of Trebbia". Hannibal: Enemy of Rome (reprint, illustrated ed.). Da Capo Press. ISBN 978-0-306-80498-4.
- Dodge, Theodore Ayrault (1891). "XIX. The Battle of the Trebia. December, 218 B.C.". Hannibal. Great Captains. Boston and New York: Houghton Mifflin and Company.
- Grundy, G.B. (1896). "The Trebbia and Lake Trasimene". The Journal of Philology 24: 83–118.
- Livy; Aubrey De Selincourt (Translator); Betty Radice (Contributor) (1965). The War with Hannibal: Books XXI-XXX of the History of Rome from Its Foundation (reprint, illustrated ed.). Penguin Classics. ISBN 978-0-14-044145-1.
- Polybius; William Roger Paton, translator (1922). The Histories. The Loeb Classical Library (in Ancient Greek, English) 2. London, New York: William Heinemann, G.P. Putnam's Sons.
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- "Invasion of Italy". UNRV History. 2003–2008. Retrieved 22 March 2009.
- Livius, Titus; Rev. Canon Roberts (Translator) (1912, 1996). "The History of Rome, Vol III". The History of Rome. London, New York, Charlottesville: J.M. Dent & Sons, E.P. Dutton & Co., Electronic Text Center, University of Virginia Library. Retrieved 10 February 2012.
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- Rickard, John (2000–2008). "Trebia, battle of, late December 218 BC". Military History Encyclopedia on the Web. Retrieved 22 March 2009.
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