Legion vs Phalanx: The Battle of Cynoscephalae, 197 BC

Who would win in a fight: a man holding a 16-foot pike, or the soldier trying to poke him with a 2-foot sword? Now multiply the question by thousands. On one side, a compact mass of pikemen, locked shoulder to shoulder behind a hedge of levelled shafts. On the other, a looser formation of soldiers wielding short swords, trained to break ranks and reform on command.

These were the Hellenistic phalanx and the Roman manipular legion, arguably the most distinctive, iconic, best trained and best armed heavy infantry units of the ancient Mediterranean. They were fielded by the Hellenistic kingdoms and the Roman Republic across the 3rd and 2nd centuries BC, in a long contest for supremacy over the eastern Mediterranean.

That rivalry prompted contemporary commanders, and later historians, to ponder a single question: who rules the battlefield? The compact, impenetrable phalanx with its far-reaching pikes? Or the more mobile, more adaptable manipular legion? One engagement in particular would tilt the balance in favour of one of the contenders and set the other on a long, declining slope.

That engagement was the Battle of Cynoscephalae, fought on a fog-shrouded hill in Thessaly in the spring of 197 BC. It was here, on a ridge the locals called the “Dog’s Head,” that the two systems collided head-on, and the verdict they produced would echo through every Roman campaign that followed.

The Antigonid Antagonist

To understand how Rome and Macedon came to blows on a Thessalian hilltop, the story must begin some 20 years earlier. In the summer of 216 BC, the Italian peninsula was being graced by the triumphal tour of a rockstar general, if ever there was one in the ancient world: Hannibal of Carthage. During the Second Punic War, the brilliant Carthaginian leader crossed the Alps and thrashed the Romans in a series of engagements, the most successful being the battle of Cannae. There, the Carthaginians executed a perfect envelopment of the enemy, leaving between 50,000 and 75,000 Romans dead.

That defeat convinced King Philip V of Macedon that the Roman upstarts were on the decline. The ambitious king, pride of the Antigonid dynasty and the premier power of the Greco-Hellenistic world, decided in 215 BC to ally himself with Hannibal. Rome was bloodied and bruised, but it still had the will to fight, and it proved as much by declaring war on Philip. This was the First Macedonian War, fought from 214 to 205 BC.

Rome’s best armies and generals were occupied defeating the Carthaginians, so this first war with the Antigonid king remained a low-intensity affair, mostly skirmishes and blockades conducted with the help of Rome’s Greek allies, the Aetolian League. In 201 BC, the Roman general Scipio defeated Hannibal, and the war with Macedon also wound down. But Philip was dead set on creating trouble.

A King’s Overreach

In 200 BC, King Ptolemy IV of Egypt died, leaving the throne to the six-year-old Ptolemy V. Philip sensed an opportunity to swallow Egypt’s possessions in what is today Turkey. He forged a secret pact with King Antiochus III of the Seleucid Empire, whose domain stretched from modern-day Turkey to Afghanistan. The two allies invaded the Ptolemaic territories, a move that alarmed the neighbouring kingdoms of Pergamon and Rhodes.

These states happened to be allies of Rome, and they appealed for help. At the same time, Philip had launched a war against Athens, sowing worry within the Aetolian League. This was too much. The Antigonid king had tried to kick Rome while it was on the ground, and now he was trying to gobble up much of the eastern Mediterranean. Rome issued an ultimatum to Philip, to the effect of: “Leave our allies alone, especially in Greece.” Philip’s reply amounted to a flat refusal.

And so the Second Macedonian War broke out. The Roman Senate appointed consul Publius Sulpicius Galba to command the expedition. Galba, however, failed to engage Philip in more than a few skirmishes, which led to his replacement by Publius Villius Tappulus in 198 BC. Tappulus’s performance proved equally underwhelming; the historian Plutarch criticised both generals, accusing them of being overly cautious.

Tappulus even had to suppress a mutiny when 2,000 of his legionnaires, veterans of the Second Punic War, demanded to return home and tend their lands.

The Man of the Hour

With morale among the legions plummeting, the Roman Republic decided on a change of leadership. Out went Tappulus, and in came the man of the hour: Titus Quinctius Flamininus. A former governor of the city of Tarentum, this energetic officer had risen to the consulship at a very young age, bypassing most of the steps required by the cursus honorum.

In 198 BC, Flamininus sailed across the Adriatic towards Greece. He brought along 3,000 crack troops from Scipio’s army, 20 elephants, and a thirst for glory. He soon reached Tappulus and his legions, encamped just 8 kilometres, or 5 miles, from Philip. The Antigonid king had stationed his army at the Aous river gorge, in modern-day Albania, a strategic position that blocked the path to Macedon.

The Roman consul then sent an envoy to Philip, signalling a willingness to negotiate. The Macedonian monarch had by now realised he was on the receiving end of Rome’s full attention, which was nothing to be happy about. Philip proposed a peace settlement, offering to withdraw from the territories conquered thus far. But Flamininus demanded more: the Macedonians should also evacuate Thessaly, a region of western Greece that had been part of Macedonia since the days of Alexander the Great.

This was a deliberately outrageous demand, and it prompted Philip to break off negotiations.

Flanked at the Aous Gorge

The king dug into his excellent defensive position at the Aous gorge, but Flamininus could count on local allies. A nobleman from Epirus named Charops acted as a guide, leading some 4,300 legionnaires across little-known tracks to attack the Macedonians from the rear. Meanwhile, the bulk of the Roman army distracted Philip with skirmishing actions and missile fire.

Philip might have been crushed there and then, but he caught sight of the incoming attack on his rear and disengaged just in time. The king saved the bulk of his army, but he lost 2,000 men and his entire supply train. As a consequence, Philip’s army had to forage food and other supplies from the land, a euphemism for pillaging, an act that angered the Greek city-states still sitting on the fence.

Flamininus, by contrast, had been careful not to anger the locals with senseless plundering. It was a wise move that earned him much-needed local support. Word started spreading that the Romans had not come to Greece as conquerors, but as liberators against the Macedonian yoke. This deliberate cultivation of goodwill would prove as decisive to the campaign as any clash of arms, denying Philip the wavering allies he badly needed and steadily isolating him within the Greek world.

Looking for a Fight

By the latter part of 198 BC and the start of 197 BC, the Romans and their allies, gathered in the Aetolian and Athamanian leagues, occupied west and southwest Thessaly, leaving the northeast and southeast to the Macedonians. Philip expected the Romans to attack in 197 BC from southwest Thessaly, and so he set up his defensive lines along the Karadag mountain range, stretching from the city of Atrax to Thessalian Thebes. This Thessalian Thebes should not be confused with the better-known Thebes in Boeotia.

In preparation for the campaign, Philip ravaged the countryside of the fertile Enipeus valley, depriving his enemies of sustenance, and stored the plundered foodstuffs in depots at Larissa, on the Peneus river. He replenished his ranks with fresh recruits and set them to drill daily, and by the end of March 197 BC the Macedonians were fighting fit. Philip then moved his army to Larissa, where he received news that the Romans and their allies had set up camp near Thessalian Thebes, some 60 kilometres to the south.

A Strategic Masterstroke

The Roman position near Thessalian Thebes was a strategic masterstroke by Flamininus. By placing his army there, he had cut Philip off from Macedonian troops garrisoned at Thessalian Thebes itself and at Demetrias, further east. He had also blocked his enemy from sizeable food stocks accumulated in the area. Philip, the able commander that he was, had already secured some supply depots, but as Napoleon would later observe, an army marches on its stomach, and feeding a host of 25,000 required far more than the depots in hand.

Flamininus’s move also secured a tactical advantage. The terrain around Thessalian Thebes was uneven, rippling with hills and ridges, exactly the kind of ground that can diminish or even nullify the power of a Hellenistic phalanx, a point that would soon prove decisive.

After learning the Romans’ location, Philip ordered his army to march south. His men did not dawdle: in a single day they reached the vicinity of Pherae, just 10 kilometres north of the Roman camp. The very next morning, just before dawn, Philip resumed his march, sending his light infantry and cavalry ahead on a reconnaissance across a nearby ridge. His scouts ran into a similar formation of Aetolians, dispatched by the Romans, sparking a small-scale but fierce clash.

The Two Armies

The Antigonid king thought better of continuing his march and redirected his forces toward Scotussa, 25 kilometres west, to forage for more food. There he encamped by the river Platanorrema to secure fresh water for his horses. Flamininus got wind of these movements and also headed west. When the Romans halted to rest, they did not realise how close they were to the enemy camp, for a crest of hills separated the two armies, a crest the locals called the Dog’s Head.

That night a heavy downpour obscured the skies, and when the sun rose, a thick, impenetrable fog hung above the ground, hampering visibility and dampening sound. According to N. G. L.

Hammond, writing in The Journal of Hellenic Studies in 1988, the date was 1 May 197 BC.

According to the ancient historian Livy, Philip fielded 25,500 men in total: 2,000 cavalry, 1,500 mercenaries, 4,000 light infantry, 2,000 elite guardsmen or “Peltasts,” and the heavy infantry, 16,000 phalangites. The phalanx was the main formation in which Greek and Hellenistic infantry fought. It consisted of infantrymen standing shoulder to shoulder in ranks, no more than 1 metre or 3 feet apart. Each rank could number up to 1,000 men, and behind the front line stood another, then another, to a depth of 16 ranks.

Anatomy of a Phalanx

Each phalangite was protected by a light but sturdy cuirass of pressed linen, plus a shield, helmet and greaves. Most importantly, every man carried a pike 5 metres, or 16 feet, long. The first four or five ranks would level their pikes forward, so an enemy faced an impenetrable forest of wooden shafts and deadly metal spikes. Phalangites drilled endlessly to march in unison, presenting a compact mass to opposing forces.

To the unfortunate soldiers facing it, a well-trained phalanx may have looked like a terrifying, giant armoured hedgehog, trampling and skewering everything in its path.

The phalanx, however, had its weak points. It derived its strength from speed of assembly and utmost cohesion. Uneven or sloping terrain could limit how quickly troops formed up in ranks, and such conditions could open gaps in the lines, allowing enemy infantry to slip into the forest of pikes and slaughter the phalangites at close range. The second weakness was an inability to turn quickly.

Meeting a phalanx head-on was a death sentence, but attacking from the flanks was another matter entirely. The very cohesion of the formation, and the unwieldy gear of the soldiers, made something as simple as turning sideways extraordinarily difficult.

The Roman Republican army had learned these lessons the hard way, during the Samnite Wars from 343 to 290 BC. Back then, the Romans too fought in a formation similar to the Greek phalanx. Battling the hill-dwelling Samnite tribes, they realised their tactics were ill-suited to mobile enemies fighting on sloping ground. So they developed a new model: the manipular legion.

The Roman Answer

A legion comprised 30 maniples, each formed of two centuries, each century consisting of 60 to 80 soldiers plus auxiliaries. The maniples deployed in three lines, in a far looser formation than the compact phalanx. In the first line fought the hastati: young, energetic, yet inexperienced soldiers. In the second came the principes, still young and strong but more seasoned. Last fought the triarii, the hardened veterans.

These three lines were not arrayed as long, continuous ranks. Instead, the blocks of legionnaires were arranged in a checkerboard pattern, the gaps between them allowing fast advances and retreats to suit the tactical needs of the moment. The arrangement also let each maniple wheel around with ease, dealing effectively with flanking manoeuvres. Their armament was likewise built for mobility.

The hastati and principes each carried two javelins, which they flung at the enemy on contact before unsheathing their fearsome primary weapon, the gladius, a short sword optimised for thrusting. The triarii, the last line of defence, fought mainly with an 8-foot, or 2.5-metre, spear.

The manipular legion was rounded out by the velites, its light infantry, and the equites, its cavalry. Both served as scouts and skirmishers and, crucially, protected the flanks of the checkerboard. At Cynoscephalae, Flamininus could field 22,000 Roman legionnaires, plus 6,400 Aetolian allies and 20 elephants. A mighty host, no doubt. But could it withstand the physical and psychological shock of a well-drilled, well-armed Macedonian phalanx?

Chance Encounter at the Dog’s Head

On the morning of 1 May 197 BC, a thick fog descended just before dawn. In the words of the historian Polybius, it was “so that one could not make out a man in front of one in the gloom.” With visibility so poor, Philip sent his scouts to the top of the nearby Cynoscephalae hill. Unbeknownst to them, on the other side of the ridge, Flamininus had had exactly the same idea.

By total chance, 300 cavalry and 1,000 light infantry, probably Aetolians, encountered a similar Macedonian force on the hilltop. One can only imagine the shock as enemy soldiers burst unexpectedly out of the shrouded, silent dawn. Dismay turned to fear, and fear to rage, as a skirmish erupted on the crest. The Aetolian units were outnumbered and pushed back down the slope.

They sent to their main camp for help, and Flamininus reacted swiftly, sending 500 horsemen and 2,000 footmen up the hill. This time the Macedonians found themselves on the losing side, retreating toward the hilltop and calling on Philip for reinforcements.

Philip was caught off guard; he had not expected the enemy so close, or in such numbers. The problem was that the king had sent most of his phalangites out foraging. But he still had troops at hand, and he ordered part of his cavalry and his mercenaries to rush up the hill and give the Romans and Aetolians a sound beating, which they did. According to Polybius, the Romans escaped a complete rout only thanks to their allies: “What mainly prevented them from routing the enemy completely was the spirit of the Aetolian cavalrymen; for they fought quite passionately and recklessly.”

The Armies Commit

The passion of the Greek horsemen partially held back the Macedonian onslaught, and the Roman light infantry held firm on the lower part of the slope. Two points are worth clarifying here. The gradient of the Dog’s Head was not exceedingly steep, which permitted cavalry action. Nonetheless, the Romans were fighting a literal uphill battle, which put them at an immediate disadvantage.

This was not lost on Flamininus. As the fog lifted, he saw the fighting on the slope and recognised that his light forces were near breaking point. He turned to the bulk of his men, still encamped, and ordered his officers to form up and approach the hill. As the legionnaires took position, he addressed them with a rousing speech: they had fought these men before and beaten them before; these were the same men they had beaten at the Aous, dug into an impregnable position, so why should this be any different on better ground?

He was confident, he told them, that it would be over quickly.

The Roman army deployed in its three lines. Flamininus ordered the right wing to stand firm, elephants to the front, then took personal command of the left wing and led it into the melee. Until that point, the Roman and allied light infantry had been suffering against Philip’s mercenaries. But when the first line of hastati joined the fight, the scales turned. Many mercenaries and Macedonian cavalry were slain, and the survivors fled uphill.

Philip Decides to Attack

On the other side of the ridge, Philip had been receiving encouraging reports from his messengers: “The barbarians will not stand up to us; now is your day, now your moment.” Philip was not convinced. The terrain was not ideal for his prized phalanx, and many of his phalangites had not yet returned from foraging. But eventually he committed to an all-out battle.

He ordered his general Nicanor to assemble the stragglers into the left wing, then took command of the right wing of the phalanx and marched immediately uphill.

When Philip reached the crest of Cynoscephalae, he saw that the Roman heavy infantry had already formed up and defeated his mercenary vanguard. He took stock: Nicanor’s left wing had yet to assemble; his own right wing was stronger, but many of his phalangites were still climbing the Dog’s Head. Regardless, Philip decided to attack. He ordered the phalanx to double the depth of its ranks, increasing the formation’s shock power, and then gave the order to charge.

The massed troops lowered their awe-inspiring pikes and descended the slope in a fast march. The Macedonian war machine was in motion, but the Romans would not retreat. Flamininus steadied the maniples on the left of his formation and braced for impact. And what an impact it must have been.

Tons of hardened bone and muscle, bronze shields and wooden shafts, propelled by a downhill march, drove their kinetic energy into hundreds of deadly metal spikes that pierced the Romans’ shields, their armour, and eventually their flesh.

The Elephant Charge

Naturally, the legionnaires were pushed back by the armoured monster they faced. Flamininus realised that his only hope lay with the right wing of his forces, still unengaged, and he rushed to it. The consul saw that the Macedonian left had not yet adopted a steady formation. Its vanguard had almost reached his right wing, another third of the Macedonian troops were still descending from the crest, and a final portion was still standing on the heights.

This was exactly what Philip had feared: the hilly terrain had prevented half of his army from forming a proper phalanx. Whatever slim hope they had of assembling was about to be crushed by Flamininus’s next move, an elephant charge. The Roman right wing surged uphill, preceded by 20 stampeding pachyderms that terrified and scattered the Macedonian forces. At this point, Polybius records, “Most of the Romans were in pursuit, killing them.”

The battlefield could now be roughly split in two. On one side, the Roman maniples and elephants were routing and massacring the Macedonians. On the other, the Macedonian phalangites were steadily skewering their foes. So far, the battle was a tie.

The Unnamed Hero

An impromptu tactical decision would tip the scales. Polybius mentions that a military tribune on the right wing noticed his companions on the left wing being slaughtered. The tribune’s name was not preserved in history, yet he can be considered the true hero of the battle. Bellowing above the din, he rallied some 20 maniples, broke them off from the victorious Roman right wing, and ordered them to rush to the aid of the left.

The legionnaires followed their tribune across the battlefield and fell upon Philip’s phalanx from the rear. This was a phalangite’s worst nightmare. Packed into a tight formation and burdened with heavy equipment, the infantrymen simply could not spin around, and they were massacred by the darting gladiuses. The maniples in front of the phalanx, who had been on the back foot, resumed the fight with renewed ferocity. The armoured, bristling monster was being crushed in a perfect pincer movement.

Philip recognised the disaster and tried to disengage. He gathered as many soldiers as he could and fled uphill. On the crest, Flamininus was finishing off the remaining resistance from Nicanor’s left wing. Polybius describes how the Macedonian phalangites eventually raised their pikes upright, a well-established sign of surrender. Flamininus apparently understood the gesture, but his men did not, or chose to ignore it. The legionnaires fell upon the surrendering soldiers and slaughtered them on the spot.

Aftermath and Legacy

Both wings of Philip’s army had been thoroughly routed, driven back beyond the ridge of Cynoscephalae. According to Polybius, the Romans and their allies lost 700 soldiers that day. The Macedonians and their allies suffered 8,000 killed in action and 5,000 taken prisoner. Philip had lost half his army, and he eventually sued for peace.

The Second Macedonian War formally ended in spring 196 BC with the ratification of a peace treaty. Its clauses left Philip’s kingdom intact but demanded that he pay a hefty tribute and disband most of his armed forces. More importantly, it forced Philip to abandon his conquests and to seek permission from the Roman Senate before conducting any campaign beyond his borders. With the victory at Cynoscephalae, the Roman Republic had effectively removed a dangerous rival and laid the foundations for its expansion into Greece and the eastern Mediterranean.

So, back to the opening question: who would win in a fight, a phalanx or a legion? Cynoscephalae was the first decisive victory of a manipular legion over a Hellenistic phalanx, and more would follow in future wars. But does that make the maniple intrinsically superior? Hammond argued that the entire battle at the Dog’s Head was a close-run affair, since the phalanx on Philip’s right was effectively dealing with Flamininus’s initial formation.

By that reading, the Roman victory was decided by the improvised action of the unnamed tribune.

A stronger argument, though, is that the tribune’s flanking attack was made possible by the very nature of the manipular legion, which allowed for adaptability, speed of reaction and manoeuvrability. The fighting on the other side of the battlefield proved the corollary: without proper cohesion, the Macedonians were helpless against the Romans, even with the higher ground. A phalanx, in the end, could prevail over a legion only if its phalangites had the time to form up properly, and only if their flanks were guarded by more mobile troops. At Cynoscephalae, the terrain and the fog denied Philip both.