The Battle of Marathon (490 BCE)

Military History: The Greeks

Chapter 4 · The Battle of Marathon (490 BCE)

Chapter 3 closed with an honest look at Sparta's own real, mixed battlefield record. This chapter covers a battle Sparta wasn't even present for: Marathon, fought entirely by Athenian hoplites and their Plataean allies against the first Persian invasion of Greece.

Background: The First Persian Invasion

In 490 BCE, King Darius I of Persia dispatched an invasion force across the Aegean, landing at the plain of Marathon roughly 40 kilometres northeast of Athens. Athens sent a runner, Pheidippides, to request Spartan help — but Sparta, observing a religious festival, delayed its own departure until the battle was already decided.

Real, Genuinely Disputed Numbers Ancient and modern sources disagree substantially: the Athenian force is generally put at around 10,000 hoplites plus roughly 1,000 Plataean allies, while Persian numbers range widely across sources, from a commonly cited 15,000–25,000 up to some estimates of 30,000. No fully settled figure exists for either side.

Miltiades's Real Tactical Deployment

Command at Marathon rested with a board of ten Athenian generals rotating daily authority; several ceded their own turn to Miltiades, giving him effective command. Facing a larger force, Miltiades made a deliberate, real tactical choice: he thinned his own center to lengthen his line and match the Persian front, while reinforcing both flanks.

The Weakened Center

Miltiades's own center was deliberately thinner than usual — a calculated risk, not an oversight, designed to let the Persian advance push it back rather than break it outright.

The Reinforced Flanks

Stronger Athenian wings held their ground and then wheeled inward once the Persian center advanced, catching the Persian force in a real, pincer-style envelopment.

Absent Persian Cavalry

Some ancient accounts suggest Persian cavalry was not present for the main engagement — a real, if disputed, factor that may explain how the Athenian line closed the distance without being broken up first.

The envelopment worked: the Persian center, having pushed into the weakened Athenian middle, found itself surrounded once the flanks closed in from both sides, and the Persian force broke and fled toward its ships. Real casualty figures, again disputed but commonly cited, put Persian losses around 6,400 against roughly 192 Athenian dead, including the polemarch Callimachus.

A Genuine Source Problem Nearly everything known about Marathon's own tactical detail comes from Herodotus, writing decades after the battle — a real limitation historians openly acknowledge rather than treating the traditional account as settled fact.

The Real Origin of the "Marathon Run" Legend

The popular story has Pheidippides running roughly 40 kilometres from the battlefield at Marathon to Athens to announce victory, then collapsing dead from exhaustion. This is not what Herodotus actually recorded.

What Herodotus Actually Wrote Herodotus describes Pheidippides running from Athens to Sparta — roughly 300 kilometres — before the battle, to request military aid, covering the distance in about 36 hours and completing his full mission in three days. Herodotus records nothing about a subsequent run from Marathon back to Athens after the battle.

The Marathon-to-Athens version first appears in the writings of Lucian, in the second century CE — roughly 600 years after the real battle. Historians think the legend likely conflated Pheidippides's real Sparta run with a separate, otherwise unnamed messenger who may have carried news of the victory back to Athens. The modern 26.2-mile marathon race itself is a real, deliberate 1896 invention for the first modern Athens Olympics, not a revival of any ancient athletic event.

Looking Ahead

Chapter 5 covers the far larger second Persian invasion of 480 BCE — Thermopylae and Salamis — where Sparta's own real, celebrated last stand actually took place.

Reflect

Question 1 Miltiades deliberately weakened his own center to strengthen his flanks — a real tactical gamble. What does this choice suggest about how a smaller or more vulnerable force can still shape a battle's outcome through formation alone?
Question 2 The "marathon run" legend took roughly 600 years to reach the form most people know today. Why might a specific, dramatic detail like this attach itself to a real historical event so long after the fact?
Question 3 Nearly all detailed knowledge of Marathon comes from a single source, Herodotus, writing decades later. How should a historian's own reliance on one dominant source shape how confidently we can describe an ancient battle's exact details?

Chapter 4 Quick Reference

  • 490 BCE: Darius I's first Persian invasion lands at Marathon; Sparta arrives too late to fight
  • Miltiades's tactic: A weakened center and reinforced flanks, enveloping the Persian advance
  • Disputed numbers: ~10,000-11,000 Greeks against a Persian force estimated anywhere from 15,000 to 30,000
  • Real Herodotus account: Pheidippides ran to Sparta before the battle (~300km), not from Marathon to Athens afterward
  • The legend's real origin: First appears in Lucian, 2nd century CE — roughly 600 years after the actual battle