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Virtue & Power

The first Persian invasion of Greece

Marathon

An Athenian and Plataean hoplite force defeated a Persian expedition on the coast of Attica, and the Greek world learned that a Persian army could be beaten.

490 BCE · Marathónas, Greece

The forces, and what the figures are worth

Athens and Plataea

Miltiades · Callimachus, the polemarch

Evidence level: Probable

Athenian hoplites

About 9,000

Not given by Herodotus; the figure derives from later authors

Herodotus gives no Athenian total. Nine to ten thousand is the standard modern reconstruction from the size of the citizen body, and is an inference rather than a report.

Evidence level: Probable

Plataean hoplites

1,000

Herodotus 6.108 records the Plataean contingent

The number is transmitted in later sources rather than by Herodotus, who records only that the Plataeans came in full force.

Evidence level: Probable

Athenian dead

192

Herodotus 6.117

A precise and plausible figure, and one Athens had institutional reason to record exactly: the dead were buried on the field and honoured as a tribe. It is among the more credible casualty numbers in Greek historiography.

The Achaemenid expedition

Datis · Artaphernes the younger

Evidence level: Literary

Persian fighting men

200,000, with 600 ships

Cornelius Nepos, Miltiades 4-5

Rejected. Nepos wrote four centuries later. Herodotus, the earliest full account, gives no total at all — a silence worth noticing in an author not usually shy of numbers.

Evidence level: Probable

Persian fighting men

Roughly 20,000 to 25,000

Modern reconstruction from the reported fleet size

The usual modern estimate, derived from transport capacity rather than from any ancient statement. Estimates range widely and none is secure.

Evidence level: Disputed

Persian dead

6,400

Herodotus 6.117

Given in the same sentence as the Athenian 192, and far less checkable. The ratio is suspiciously clean and has been read as a commemorative figure rather than a count.

What happened

A Persian force landed on the bay of Marathon, on the advice of the exiled Athenian tyrant Hippias, intending to draw the Athenian army out of the city or to find support inside it. The Athenians marched out and held the passes for several days rather than engaging.

Herodotus reports that the ten Athenian generals were divided and that the polemarch Callimachus cast the deciding vote for battle, persuaded by Miltiades. The Athenians then attacked across the plain at a run, with their centre thinned and their wings at full strength.

The Persian centre broke through the weakened Athenian middle. The Athenian wings defeated the troops opposite them, turned inward, and closed on the Persian centre from both sides. The Persians broke for their ships, losing men in the marshes.

The Athenian army then marched back to the city at speed, arriving before the Persian fleet could round Cape Sounion and reach Phaleron. The fleet withdrew.

Tactics

The thinned centre and reinforced wings are the earliest clearly reported instance of deliberate asymmetry in a Greek line, and the manoeuvre most often cited as the beginning of Greek tactical thought. Whether it was designed or improvised is not recoverable — Herodotus reports the dispositions without explaining them. The run across the last stretch of ground is best understood as a way of crossing the killing zone of Persian archery quickly, not as a charge from a distance, which armoured men could not sustain.

Consequence

Marathon did not end the Persian threat; the second invasion came ten years later and was far larger. Its consequences were political and psychological. It established that a Persian force could be defeated in open battle by heavy infantry, it gave Athens a founding military memory that the democracy used continuously, and it made Miltiades briefly the most powerful man in the city.

Location

Evidence level: Documented

The plain of Marathon, north-east Attica

Modern: Marathónas, Greece

The location is not in doubt. The Soros, the burial mound raised over the Athenian dead, still stands on the plain and was excavated in the nineteenth century.

Archaeology

Evidence level: Documented

The Soros, the tumulus over the Athenian dead, stands on the plain and contained cremation burials and pottery consistent with the early fifth century. A second mound is traditionally identified as the Plataean grave. The battlefield's coastline has shifted considerably since antiquity, which complicates reconstruction of the fighting ground.

Open questions

Evidence level: Literary

Did a runner carry the news to Athens and die?

Herodotus, the earliest source, describes Pheidippides running to Sparta before the battle to request help — a distance of some 240 km — and says nothing about a run to Athens afterwards. The story of a runner dying on arrival with news of the victory appears centuries later in Plutarch and Lucian, and the sources do not agree on his name. The modern marathon race commemorates a story the earliest account does not contain.

Evidence level: Disputed

Why did the Persians divide their force?

Herodotus reports that the Persian cavalry was absent from the fighting without explaining why. A later proverb, 'the horse are away', has been read as evidence that they had re-embarked for a move on Athens. The explanation is a reconstruction, and the absence of cavalry from the narrative remains one of the battle's genuine puzzles.

Primary sources

  • Herodotus, Histories 6.94-120

    The fullest ancient narrative, written roughly a generation and a half after the battle.

  • Cornelius Nepos, Miltiades 4-5

    A short Latin life giving figures for the Persian force that Herodotus does not give.

  • Plutarch, On the Glory of the Athenians 347c

    One of the sources for the story of a runner carrying news of the victory to Athens.

Reception

Marathon became an Athenian civic memory almost immediately and has been recruited repeatedly since — as a founding moment of democracy, of Europe, or of the West. Those are claims about later politics rather than about 490 BCE, and this platform describes them as reception rather than adopting them.

How to read the evidence labels

Evidence level: Documented
Supported by a named primary text or by excavated material evidence.
Evidence level: Probable
Supported by strong inference that most specialists accept.
Evidence level: Disputed
Substantial specialist disagreement exists; competing readings are stated.
Evidence level: Literary
Belongs to poetic or mythological construction rather than to history.
Evidence level: Mythological
Belongs to shared religious or mythic tradition rather than to any single text.
Evidence level: Unknown
The available evidence is insufficient to decide.

These labels describe the status of the evidence, not our confidence in a conclusion. A claim marked Literary is not a claim we doubt; it is a claim about what kind of thing a poem is.