Introduction

On the morning of the Battle of Cynoscephalae, visibility failed before either army did. Ridges concealed the Roman proconsul Titus Quinctius Flamininus from King Philip V of Macedon, while rain from the previous night settled into fog so thick that men nearby became difficult to see. Philip sent troops toward the high ground. Flamininus, unsure where the Macedonians were, sent cavalry and light infantry to find them. The patrols collided, called for help, and made their commanders answer a succession of local emergencies.1

From that obscured beginning, in which neither commander saw the battle whole, came one of antiquity's most durable tactical verdicts. Polybius, whose account is the closest surviving narrative, followed the battle with a comparison of the Macedonian phalanx and the Roman legion. The phalanx concentrated men and long pikes into a frontal force that he considered nearly irresistible on suitable ground. Roman maniples, however, were spaced in separate units and supported by reserves, so they could act across a greater variety of places and situations. Later histories often reduce Cynoscephalae to the moment when the flexible legion exposed the rigid phalanx.2

Set beside that familiar summary, however, Polybius's own battle narrative makes a richer and less tidy case. Philip's formed right wing drove Roman infantry backward, and the Macedonian left was defeated while it was still arriving in marching order. Aetolian cavalry, Roman elephants, Flamininus's decision to preserve his right, and the initiative of an unnamed military tribune connected those unequal fights. Rome's organization mattered, but it worked through people who recognized a changing battle before the opposing army could join its own halves.

Ground Neither Army Had Chosen

Before the ridge divided the armies, the Second Macedonian War had already narrowed Philip's choices by depleting Macedonian manpower through successive campaigns. Livy still gives the king a phalanx of 16,000, supported by peltasts, Thracians, Illyrians, mercenaries, and cavalry. The Roman and allied army was nearly equal in total strength, with Aetolian horsemen providing an important advantage in cavalry. Both forces were coalitions, and neither could be understood by its signature heavy infantry alone.3

That wider mixture first mattered near Pherae, where walls, gardens, and cultivated plots made the ground unattractive for a set battle. Philip moved toward Scotussa in search of supplies and more favorable country; Flamininus marched to threaten the grain before Philip could use it. Hills between their routes hid each column from the other for two days, so operational purpose brought the armies close without giving either commander a common view of the field. Their camps lay somewhere on opposite sides of the ridges called Cynoscephalae, the “Dog's Heads.”4

Because the precise ground remains contested, its location cannot resolve the battle by itself. N. G. L. Hammond argued from supply and topography for a site farther west than earlier reconstructions, whereas Matthew Sears and C. Jacob Butera have recently proposed rolling, parallel ridges and a position deliberately selected by Flamininus. Their published abstracts establish the disagreement but do not provide enough detail to settle it here. The surviving narratives and both modern proposals do agree on the features that governed the morning: broken sight lines, rising ground, and separated approaches.5

A Skirmish Climbs the Ridge

Because those separated approaches denied both commanders a view across the ridge, reconnaissance became an armed contest. Polybius first places about ten Roman cavalry squadrons and a thousand light infantry against Philip's covering force. Surprise disordered both parties, but they recovered, fought, and sent messengers downhill. Flamininus committed two thousand infantry and five hundred cavalry; Philip answered with Macedonian and Thessalian horse, mercenaries, and other auxiliaries. What began as a search for information became a struggle for the heights through repeated reinforcement.6

As the Macedonian reinforcements drove the Romans back, Aetolian cavalry prevented a retreat from becoming a rout. Polybius is openly critical of Aetolian infantry in formal battle, yet he praises the horsemen's skill in detached combat. By crediting them with checking the advance near the foot of the hills, he also gives the cavalry the time Flamininus needed to form his heavy infantry. Their stand also exposes how much the later legion-phalanx comparison leaves outside its frame: the Roman line reached the fight because allied cavalry held the interval before it. 7

That interval closed on Philip through messengers who could see only a local success. They reported Romans fleeing and pressed the king to seize his opportunity, even though he disliked both the ground and the timing. As the fog lifted, Philip first sent more support and then committed the peltasts and the right wing of his phalanx. Virginia Fabrizi's comparison of the ancient narratives shows that Livy intensifies the king's hesitation and lets the clearing fog guide the reader through Philip's changing perception. Polybius gives the same decision a harder operational edge: men already engaged near the Roman camp needed help, and the rest of the phalanx was still climbing.8

Half a Phalanx Wins

Once Philip's right reached the crest, he wheeled it into line, doubled its depth, and ordered the pikes lowered; the formation descended with high ground, close order, and the weight of its ranks behind it. Roman swords and shields did not dissolve that advantage. Flamininus's left suffered casualties and gave ground because, as Polybius plainly states, it could not sustain the charge.9

The Macedonian success places an important limit on any claim that terrain by itself defeated the phalanx. On one part of the same ridge, formed pikemen used the slope effectively. Their dense frontage protected the men behind a hedge of pike points, while depth added pressure to the advance. Such cohesion also carried a cost: troops packed for frontal force could not readily reverse direction, and subordinate groups had little room to separate from the larger body. For the moment, however, those liabilities remained behind Philip's advancing right. 10

The Wing Still on the March

While Philip's right forced the Roman left downhill, his remaining phalanx reached the heights as a column. Some men had only just appeared on the ridge, others were descending toward the Romans, and no commander had formed them into the close line that gave the phalanx its strength. Flamininus left the losing wing to its slow retreat and went to the Roman right, where his elephants and heavy infantry still waited. He attacked the Macedonians before they could turn arrival into deployment.11

Elephants delivered the first shock against troops that lacked both order and direction. The Macedonian left broke without meeting the Roman infantry in a proper phalanx, and Flamininus's men pursued it over the crest. Livy turns the contrast into a sharp image, describing a column suited to marching instead of a line ready to fight. The phrasing is memorable because it locates the failure in time as well as terrain: one wing had already become a weapon, while the other had not completed the movement that made the weapon possible.

The Tribune without a Name

The Roman pursuit might have carried the victorious right away from the battle still being lost, but an unnamed military tribune saw Philip's successful wing extended down the opposite slope. He detached no more than twenty maniples, wheeled them away from the routed Macedonian left, and marched toward the rear of the phalanx pressing the Roman infantry. By attributing the decision to the tribune himself, Polybius makes the attack an act of subordinate initiative. It reached men whose pikes and close ranks faced downhill, and pressure from front and rear turned their advance into flight.12

Because a manipular legion placed infantry in distinct bodies with officers, intervals, and lines in depth, the tribune's decision could become a maneuver. Reserves could reinforce a threatened point or move toward a new one without turning the whole army. Paul Erdkamp also stresses the human conditions behind the diagram: ancient commanders saw little, messages moved slowly, and experienced subordinate leaders had to control men amid noise and fear. Michael Rasak calls the tribune's action an example of mission command, a modern category that should not be projected backward as Roman doctrine. The evidence supports a narrower claim: a Roman officer possessed troops, space, and accepted authority with which to act on a fleeting view of the Macedonian rear.13

What Polybius Wanted the Battle to Prove

The tribune's maneuver leads naturally to Polybius's conclusion that Roman formations worked across more kinds of ground and action. His comparison begins fairly: he insists that an intact phalanx on level ground cannot be met frontally, because each Roman would face several ranks of pikes. From that frontal impact, he shifts the comparison toward adaptability, arguing that ditches, ridges, pursuit, retreat, reserves, and attacks from an unexpected direction break the single condition on which the phalanx depends. Roman units, in his account, can fight as an army, a maniple, or a smaller party.14

Yet the battle he has just narrated is not a neutral demonstration. Polybius admired practical explanations and Roman institutions, and his sequence selects Cynoscephalae as the occasion for a general lesson. Once the formations meet, a formed phalanx wins its local contest; an unformed wing loses; allies and elephants shape both results; a Roman subordinate then joins them. Livy's version, which follows Polybius closely, adds its own dramatic and moral pressure through fog and Philip's emotions. It even says the Macedonians set aside their long pikes where Polybius says they lowered them, a divergence that should be exposed rather than blended into a smoother story.15

Victory Shared and Claimed

Once the Macedonian line broke, source problems continued into the pursuit and its reported cost. Polybius reports about 700 Roman dead, 8,000 Macedonians killed, and at least 5,000 captured; Livy repeats those figures while rejecting Roman annalists who inflated the Macedonian dead to 32,000 or 40,000. His skepticism is useful, although the lower totals still come from the same Polybian tradition and cannot be treated as independent agreement. The fighting also ended in a failed gesture: some Macedonians raised their pikes in surrender, but Roman soldiers who did not understand the signal continued the attack.16

Even the plunder carried the coalition's unresolved claims away from the ridge, for Aetolians reached Philip's camp first and took much of it, angering Roman soldiers who believed they had borne the risk. Aetolian leaders also claimed a larger share of the credit than Flamininus would concede, even though their cavalry had helped keep his opening defeat from becoming irreversible. The quarrel carried into peace negotiations, where Flamininus wanted Philip contained without leaving the Aetolian League dominant in Greece.17

Philip accepted an armistice, hostages, indemnity, and the loss of possessions beyond Macedonia; the settlement dismantled his position in Greece while preserving his kingdom. Rome soon proclaimed Greek communities free, though garrisons and competing allied claims complicated the promise. Cynoscephalae decided the war and accelerated Rome's eastern power, while the settlement left Macedon intact and Aetolian claims unresolved.18

Conclusion

Cynoscephalae shows why the legion eventually proved more adaptable without pretending that swords simply defeated pikes. Philip's right wing formed, charged, and won the frontal contest Polybius said it should win. His left reached the battle too late to become the same kind of force, while Aetolian cavalry, Roman elephants, and Flamininus's uncommitted wing kept Roman choices open long enough for the difference to matter.

What turned difference into decision happened below the level of the two famous commanders. An officer whose name the sources did not preserve looked away from the enemy already fleeing, recognized the contest still unresolved beyond the ridge, and led his maniples toward Philip's rear. The legion's advantage became visible in that movement from one battle to the other.

Endnotes

  1. Polybius, Histories 18.20–22, trans. W. R. Paton, vol. 5, Loeb Classical Library (Cambridge, MA: Harvard University Press, 1926), public-domain edition; Virginia Fabrizi, “War, Weather and Landscape in Livy's Ab Urbe Condita,” in Landscapes of War in Greek and Roman Literature, ed. Bettina Reitz-Joosse, Marian W. Makins, and C. J. Mackie (London: Bloomsbury Academic, 2022), 44–49, open-access volume record. ↩
  2. Polybius, Histories 18.28–32; Paul Erdkamp, “Warfare and Battle in the Roman World, 700 BC–AD 235,” in The Encyclopaedia of Ancient Battles, ed. Harry Sidebottom and Michael Whitby (Chichester: Wiley-Blackwell, 2017), PDF pp. 5–7, accepted manuscript. ↩
  3. Livy, History of Rome 33.3–4, trans. Rev. Canon Roberts (New York: E. P. Dutton, 1912), Perseus edition. ↩
  4. Polybius, Histories 18.19–20; Livy, History of Rome 33.5–6. ↩
  5. N. G. L. Hammond, “The Campaign and the Battle of Cynoscephalae in 197 BC,” Journal of Hellenic Studies 108 (1988): 60–82, abstract, https://doi.org/10.2307/632631; Matthew A. Sears and C. Jacob Butera, “Fighting on the Dog's Heads: Cynoscephalae and the Search for the Ideal Ancient Battlefield,” Journal of Military History 89, no. 3 (2025): 576–99, abstract, Society for Military History issue page. Only the abstracts were accessible and are used here solely to define the location dispute. ↩
  6. Polybius, Histories 18.20–22; Adam O. Anders, Roman Light Infantry and the Art of Combat: The Nature and Experience of Skirmishing and Non-Pitched Battle in Roman Warfare, 264 BC–AD 235 (PhD diss., Cardiff University, 2011), 146–47, 223–25, open-access thesis. ↩
  7. Polybius, Histories 18.22.3–7; Anders, Roman Light Infantry, 223–25. ↩
  8. Polybius, Histories 18.22–24; Livy, History of Rome 33.7–8; Fabrizi, “War, Weather and Landscape,” 44–49. ↩
  9. Polybius, Histories 18.24–25. Polybius says the pikes were lowered for the charge; Livy, History of Rome 33.8–9, instead says their length led Philip to order them set aside. ↩
  10. Polybius, Histories 18.25, 29–31; Erdkamp, “Warfare and Battle,” PDF pp. 5–7. ↩
  11. Polybius, Histories 18.25; Livy, History of Rome 33.9. ↩
  12. Polybius, Histories 18.26; Michael J. Rasak, Mission Command in Ancient Rome, 218 BC–AD 100 (Fort Leavenworth, KS: Army University Press, 2024), 25–26, official PDF. ↩
  13. Erdkamp, “Warfare and Battle,” PDF pp. 5–7; Rasak, Mission Command, 22–27. ↩
  14. Polybius, Histories 18.28–32. ↩
  15. Polybius, Histories 18.24–31; Livy, History of Rome 33.8–9; Fabrizi, “War, Weather and Landscape,” 44–49. ↩
  16. Polybius, Histories 18.26–27; Livy, History of Rome 33.10. ↩
  17. Polybius, Histories 18.27, 34–39; Livy, History of Rome 33.10–13. ↩
  18. Polybius, Histories 18.39, 42, 44–48; Livy, History of Rome 33.30–34. ↩

Bibliography

Primary Sources

  • Livy. History of Rome. Translated by Rev. Canon Roberts. New York: E. P. Dutton, 1912. Book 33. Perseus edition.
  • Polybius. The Histories. Translated by W. R. Paton. Vol. 5. Loeb Classical Library. Cambridge, MA: Harvard University Press, 1926. Book 18. Public-domain edition.

Secondary Sources

  • Anders, Adam O. Roman Light Infantry and the Art of Combat: The Nature and Experience of Skirmishing and Non-Pitched Battle in Roman Warfare, 264 BC–AD 235. PhD diss., Cardiff University, 2011. Open-access thesis.
  • Erdkamp, Paul. “Warfare and Battle in the Roman World, 700 BC–AD 235.” In The Encyclopaedia of Ancient Battles, edited by Harry Sidebottom and Michael Whitby, 116–51. Chichester: Wiley-Blackwell, 2017. Accepted manuscript.
  • Fabrizi, Virginia. “War, Weather and Landscape in Livy's Ab Urbe Condita.” In Landscapes of War in Greek and Roman Literature, edited by Bettina Reitz-Joosse, Marian W. Makins, and C. J. Mackie, 38–61. London: Bloomsbury Academic, 2022. Open-access volume record.
  • Hammond, N. G. L. “The Campaign and the Battle of Cynoscephalae in 197 BC.” Journal of Hellenic Studies 108 (1988): 60–82. https://doi.org/10.2307/632631.
  • Rasak, Michael J. Mission Command in Ancient Rome, 218 BC–AD 100. Art of War Papers. Fort Leavenworth, KS: Army University Press, 2024. Official PDF.
  • Sears, Matthew A., and C. Jacob Butera. “Fighting on the Dog's Heads: Cynoscephalae and the Search for the Ideal Ancient Battlefield.” Journal of Military History 89, no. 3 (2025): 576–99. Society for Military History issue page.