Second Persian Invasion of Greece

The Second Persian Invasion of Greece (480–479 B.C.) was the massive military campaign launched by Xerxes the Great of the Persian Empire to conquer the Greek mainland and punish the city‑states that had resisted Persian rule during the First Persian Invasion of Greece. It produced some of the most famous battles in ancient history, including Thermopylae, Salamis, Plataea, and Mycale.

Background

After the failure of the first invasion under Darius I the Great, Persia spent a decade preparing a far larger and more comprehensive campaign. Xerxes assembled one of the largest armies of antiquity, drawing troops from across the empire: Babylonia, Egypt, Phoenicia, Cilicia, Ionia, Media, Assyria, and many other subject nations.

The Greeks, recognizing the scale of the threat, formed the Hellenic League under the leadership of Sparta and Athens. Themistocles persuaded Athens to build a powerful fleet of triremes, which would prove decisive in the coming conflict.

Persian Preparations

Xerxes ordered the construction of:

A canal through the Chalcidice peninsula to avoid storms
A pontoon bridge across the Hellespont to transport his army
Massive supply depots along the invasion route

Ancient sources describe the Persian army as numbering in the hundreds of thousands, supported by a fleet of over 600 warships.

Greek Strategy

The Greek plan relied on:

Holding the narrow pass at Thermopylae
Blocking the Persian fleet at the Battle of Artemisium
Using the terrain to neutralize Persian numerical superiority
Preserving the Athenian fleet as the decisive arm of Greek defense

Themistocles’ strategic vision centered on forcing the Persians into confined waters where Greek seamanship and hoplite marines could dominate.

Major Battles

Battle of Thermopylae (480 B.C.)

King Leonidas I of Sparta led a small allied force to block the Persian advance. After days of resistance, the Greeks were outflanked and defeated, but their stand became legendary for its heroism and sacrifice.

Battle of Artemisium (480 B.C.)

Fought concurrently with Thermopylae, the Greek fleet engaged the Persians in a series of naval actions. Although indecisive, the battle delayed the Persian advance and preserved the Greek fleet for later engagements.

Battle of Salamis (480 B.C.)

The turning point of the invasion. Themistocles lured the Persian fleet into the narrow straits of Salamis, where Greek triremes inflicted a devastating defeat. Persian losses crippled Xerxes’ naval power and forced him to withdraw the bulk of his army back to Asia.

Battle of Plataea (479 B.C.)

The remaining Persian forces under Mardonius were defeated by a united Greek army led by Sparta. This battle ended Persian hopes of conquering Greece by land.

Battle of Mycale (479 B.C.)

On the same day as Plataea, the Greek fleet destroyed the remnants of the Persian navy near Mycale in Asia Minor. This final victory ended the invasion and liberated the Ionian Greeks.

Aftermath

The failure of the invasion marked the end of Persian attempts to conquer mainland Greece. The Greek victories preserved the independence of the city‑states and laid the foundation for the Golden Age of Athens.

The war also demonstrated:

The strategic importance of naval power
The effectiveness of Greek hoplite warfare
The value of unified Greek resistance
The limitations of Persian logistics in hostile terrain

Significance

Secured the future of Western civilization’s classical heritage
Enabled the rise of Athens as a major naval and cultural power
Weakened Persian influence in the Aegean
Inspired later Greek unity against foreign threats

Sources

Encyclopedia of Military History, Dupuy & Dupuy (1979)