The Mysterious Army That Avenged the 300 at Plataea That Historians Still Can't Fully Explain

The Battle of Thermopylae and the 300 Spartans have consumed most of the historical oxygen in the story of the Persian Wars — but the battle that actually ended the Persian invasion of Greece happened a year later at Plataea in 479 BC, where a Greek coalition force defeated the Persian army so decisively that Xerxes never returned. The coalition that fought at Plataea was itself something Greek city-state politics shouldn't have been able to produce: Spartans, Athenians, Corinthians, Tegeans, and dozens of smaller poleis operating under unified command against a Persian force that significantly outnumbered them. How that coalition held together, who actually commanded it, and what tactical decisions produced the outcome historians still debate make Plataea one of antiquity's most consequential and least understood battles.