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Battle of Thermopylae and destruction of Athens

At the Battle of Thermopylae, a small force of Greek warriors led by King Leonidas of Sparta resisted the much larger Persian forces, but were ultimately defeated. According to Herodotus, the Persians broke the Spartan phalanx after a Greek man called Ephialtes betrayed his country by telling the Persians of another pass around the mountains. At Artemisium, large storms had destroyed ships from the Greek side and so the battle stopped prematurely as the Greeks received news of the defeat at Thermopylae and retreated.

After Thermopylae, Athens was captured. Most of the Athenians had abandoned the city and fled to the island of Salamis before Xerxes arrived. A small group attempted to defend the Athenian Acropolis, but they were defeated. Xerxes ordered the Destruction of Athens and burnt the city, leaving an archaeologically attested destruction layer, known as the Perserschutt. The Persians thus gained control of all of mainland Greece to the north of the Isthmus of Corinth.