The Persian Threat to Greece
By the late 6th century BC, the Achaemenid Persian Empire was the largest the world had yet seen, stretching from modern-day Iran across Anatolia, Egypt, and into Central Asia. When Greek city-states on the Ionian coast of Asia Minor (modern Turkey) revolted against Persian rule, Athens sent ships in support. For the Persian King Darius I, this was an act of war that demanded punishment.
In 490 BC, Darius dispatched a fleet and army across the Aegean with a clear mission: subdue the Greeks, punish Athens and Eretria, and demonstrate Persian dominance. What followed at the plain of Marathon would become one of history's most celebrated military upsets.
The Forces at Marathon
The Persian force landed on the coastal plain of Marathon, roughly 40 kilometres north of Athens. Estimates of Persian troop numbers vary widely in ancient sources, but they almost certainly outnumbered the Greek defenders significantly. The Athenians, reinforced by a small contingent from the city-state of Plataea, numbered around 10,000 hoplites. Athens had sent to Sparta for aid, but the Spartans were observing a religious festival and arrived too late for the battle.
Command of the Athenian forces rotated among ten generals (strategoi), though Miltiades — who had personal experience fighting alongside the Persians — was the driving strategic voice. The Greek polemarch (war-leader) Callimachus ultimately authorised the decision to attack rather than wait.
The Battle: A Tactical Masterstroke
Miltiades made a bold and counterintuitive choice. Rather than facing the Persians in a static defensive line, the Athenians advanced at a run — an unusual tactic that minimised their exposure to Persian arrows. The Greek phalanx formation, with warriors bearing overlapping shields and long spears, was ideally suited for close combat but vulnerable to missile fire at range.
Miltiades also deliberately weakened the Greek centre while strengthening the flanks. The Persians, confident in their superior numbers, pushed through the Greek centre — only to find themselves enveloped on both sides as the stronger Greek flanks wheeled inward. The Persian force was routed and driven back to their ships. Ancient sources record that the Greeks lost fewer than 200 men; Persian casualties were far greater.
The Legend of Pheidippides
The Battle of Marathon gave the world more than a famous victory — it gave us the marathon race. Legend holds that a runner named Pheidippides (or Philippides) ran from Marathon to Athens to announce the victory, gasping the word "Nenikékamen" ("We have won") before collapsing and dying. While the historical details are disputed, the story inspired the modern marathon race introduced at the 1896 Athens Olympics, covering the approximate distance from Marathon to the Panathenaic Stadium.
Why Marathon Mattered
The significance of Marathon extended far beyond military victory. It proved that the Persian Empire could be beaten. It elevated the prestige of Athens, fuelling the democratic confidence and cultural energy that would produce the Golden Age of Pericles within a generation. And it established the Greek hoplite — the citizen-soldier — as a formidable fighting force.
Historical Legacy
The Greeks who fell at Marathon were buried in a mound on the battlefield called the Soros, which can still be visited today. They were honoured as heroes. The battle became a cornerstone of Athenian identity, referenced in art, drama, and oratory for generations. The Persian Wars as a whole — Marathon, Thermopylae, Salamis, Plataea — forged a Greek identity distinct from the East, and that distinction would echo through the centuries that followed.