During the second Persian invasion of Greece, which took place from 480 to 479 BCE, Athens was captured and subsequently destroyed by the Achaemenid Empire. A prominent Greek city-state, it was attacked by the Persians in a two-phase offensive, amidst which the Persian king Xerxes the Great had issued an order calling for it to be torched. The Persian army commander Mardonius oversaw the razing of several structures of political and religious significance throughout the city, including the Acropolis, the Old Temple of Athena, and the Older Parthenon. One year later, the Greek coalition retook Athens and dealt a devastating defeat to the Persian army during the Battle of Plataea, killing Mardonius and setting the stage for the eventual expulsion of all Persian troops from southern Greece.

Athens' destruction by the Persians prompted the Greeks to build the Themistoclean Wall around the city in an effort to deter future invaders, and the event continued to have an impact on Greek society for a prolonged period; a number of Athenian artifacts that had been taken to Persia during the Greco-Persian Wars were returned to Greece during the Wars of Alexander the Great, and according to the Greek historians Plutarch and Diodorus, it was the legacy of the Persian assault on Athens that ultimately influenced Alexander's decision to burn down the Palace of Persepolis near the end of his conquest of Persia in 330 BC.

First phase: Xerxes I (480 BCE)

"The Citadel at Athens" at the time of Xerxes I (1900 impression by American writer Jacob Abbott)

In 480 BCE, following the Battle of Thermopylae, all of Boeotia fell to the Persian army. Thespiae and Plataea, the two Greek cities that had resisted Xerxes, were captured and subsequently razed. Attica was left open to a Persian offensive, and the remaining population of Athens was thus evacuated, with the aid of the Greek fleet, to Salamis.[1] The Peloponnesians began to prepare a defensive line across the Isthmus of Corinth, building a wall and demolishing the road from Megara, thereby abandoning Athens to the Persians.[2]

Athens fell a first time in September 480 BCE.[3] The small number of Athenians who had barricaded themselves on the Acropolis were eventually defeated, and Xerxes then ordered his troops to torch the city.[4] The Acropolis was razed, and the Old Temple of Athena and the Older Parthenon were destroyed:[5]

Shortly thereafter, Xerxes lost a large part of his fleet to the Greeks during the Battle of Salamis. With the Persians' naval superiority removed from the war, Xerxes feared that the Greeks might sail to the Hellespont and destroy his pontoon bridges.[7] According to Herodotus, Mardonius volunteered to remain in Greece and complete the campaign with a hand-picked group of troops while advising Xerxes to retreat to Asia with the bulk of the Persian army.[8] Attica was abandoned by the Persians, with Mardonius overwintering in Boeotia and Thessaly.[9]

Some Athenians were thus able to return to their burnt-out city for the winter,[9] but they would again have to evacuate in the face of another Persian offensive in June 479 BCE.[3]