Battle of Plataea

Setting the scene

By 479 BCE, the Persian invasion of Greece had stalled. After Thermopylae, the Persians sacked Athens, but their fleet was destroyed at Salamis in 480 BCE. Xerxes returned to Asia, leaving General Mardonius with an army to complete the conquest. Mardonius wintered in Thessaly and in 479 BCE attempted to split the Greek alliance by offering Athens favorable terms. The Athenians refused, and the Greeks united under Spartan leadership to confront the Persians.

What happened

In August 479 BCE, near Plataea in Boeotia, a Greek army of about 40,000 hoplites faced Mardonius's Persian force of perhaps 60,000-100,000 (including Greek allies). The armies faced each other for 11 days. The Greeks, led by Spartan regent Pausanias, were running low on water when they attempted a night retreat. The Persians attacked, thinking the Greeks were fleeing. The Spartan and Tegean hoplites held firm, then counterattacked. Mardonius was killed, and the Persian army collapsed and was massacred. On the same day (according to tradition), the Greek fleet destroyed the Persian navy at Mycale in Ionia.

Why it still matters

The Battle of Plataea ended the Persian invasion of Greece decisively. It was the final land battle of the Greco-Persian Wars and ensured Greek independence. Plataea, along with Salamis, preserved Greek civilization and, by extension, the foundations of Western culture—philosophy, democracy, and science. The victory demonstrated the superiority of Greek hoplite tactics and unity against a common enemy. After Plataea, the Greeks went on the offensive, eventually liberating Ionia. The battle confirmed that Persia could not conquer Europe, establishing a boundary between East and West that would persist for centuries. Plataea is less famous than Thermopylae but was far more consequential.

Background

It helped secure Greek independence from the invasion. Even centuries later, this episode remains a reference point for how empires rise, fracture, and transform.