The Persian Wars of 490-479 BC — Marathon, Thermopylae, Salamis, Plataea — are the most mythologized events in ancient history, so layered with later interpretation that recovering the actual events is genuinely difficult.

Herodotus, our main source, was writing roughly forty years after the events, drew on oral tradition of variable quality, and had a narrative agenda that shaped his account. The actual Greek-Persian relationship was considerably more complex than the 'clash of civilizations' framing suggests. Greek poleis had continuously traded with, allied with, and mercenary-served Persia throughout the period. Many Greek poleis 'medized' — sided with Persia — and didn't see this as obviously dishonorable.

The scale of the engagements is consistently exaggerated in our sources. Herodotus' figure of 5.2 million for Xerxes' force is impossible by ancient logistical standards; modern estimates range from 100,000 to 300,000 — still enormous but not the impossible numbers Herodotus gives.

None of this diminishes the genuine military achievements of the Greek defenders. It does suggest we should read the standard narrative more critically.