Why was the Battle of Plataea considered one of the most decisive Greek victories?

The Battle of Plataea (479 BCE) is considered one of the most decisive Greek victories because it effectively ended the Persian threat to the Greek mainland. While the Persian fleet had been weakened at the Battle of Salamis and later at Mycale, the Persian general Mardonius remained in Greece with a vast army, posing a persistent danger.1234

The victory was significant for several reasons:

• Crushing Defeat: Under the leadership of the Spartan Pausanias, the Greek hoplite infantry overcame a numerically superior Persian force. The death of Mardonius during the battle caused the Persian ranks to break and flee, leading to heavy casualties.143
• End of Invasions: The battle resulted in the final retreat of the Persian army from the Greek mainland. Although hostilities between the Greeks and Persians continued for years, the Persians never again attempted a full-scale invasion of Greece.23
• Symbol of Liberty: The triumph was celebrated as a victory for the "liberty of the Greeks," commemorated annually at Plataea in honor of the heroes who fought against the "barbarians".4