The Battle of Marathon is misremembered
The famous runner did not sprint from the battlefield to Athens with the news of victory and then drop dead. That story is a later legend. Pheidippides ran before the fighting, all the way to Sparta, to ask for help. The Spartans said they would come after the Carneia festival ended — after the full moon. In other words: do not wait. Athens had to decide without them.
That decision is the real story of 490 BC.
Athens was a young, still-fragile democracy. The Peisistratid tyranny had ended only twenty years earlier. Cleisthenes’ reforms of 508/7 had created the assembly, the ten tribes, the Council of 500, and the ten elected generals. The city was not yet the naval empire of the next generation. Its strength was the hoplite militia of citizen-farmers. The last tyrant, Hippias, was sailing with the Persian fleet. He hoped a landing at Marathon would produce a coup inside the city and restore him. Some aristocratic houses were later accused of being willing to open the gates.
When Eretria fell and the Persian fleet turned toward Attica, the Athenians faced a choice: stay behind their walls or march out. The walls of 490 were not the later Themistoclean circuit. The Acropolis was the real strongpoint. Waiting inside risked a siege, possible treachery, and the ruin of the Attic countryside. Miltiades, one of the ten generals and a man who had once ruled in the Chersonese under Persian oversight, argued they must meet the enemy in the field before the Persians could use their cavalry or receive help from inside the city. The assembly voted to march.
Roughly 9,000–10,000 Athenian hoplites and 1,000 Plataeans left for Marathon, about 40 km away. They left the city itself thinly garrisoned.
They chose the ground. They thinned the centre and weighted the wings. They charged across open ground to close the distance under arrow fire. The Persian centre pushed the Greek centre back; the Greek wings broke the flanks and wheeled inward. The Persians broke for their ships. Callimachus died in the pursuit. Herodotus’ numbers — 6,400 Persian dead, 192 Athenian — are unusually precise and broadly accepted as in the right order of magnitude.
It was not one-sided. The Persians had numbers, cavalry, and a large fleet. They simply did not anticipate the wing manoeuvre, or they could not bring their horse into play in time. They would fight again.
Victory at Marathon was not the end of the day. The Persian fleet put to sea and rounded Sounion, apparently intending to strike Athens while its army was still in the field. The hoplites force-marched back and arrived in time. The Persians saw the army already in position and sailed away.
The victory gave the new democracy prestige and confirmed it in the eyes of many citizens. It did not make Athens safe. Ten years later a far larger army under Xerxes forced the complete evacuation of the city.
That is the Athens of 490: a recently democratised city-state of citizen-soldiers, still small by later standards, betting everything on a single battle rather than a siege. The runner who mattered was the one who went to Sparta. The choice that mattered was the decision to fight in the open rather than wait behind walls for a tyrant and a fifth column. The rest is memory layered on top of a hard, closely run day.

