History Trivia: What year did the "Battle of Thermopylae" occur?

Question

First one to answer correctly gets 10 points.

Answer 1

In the Battle of Thermopylae of 480 BC an alliance of Greek city-states fought the invading Persian army in a mountain pass. Vastly outnumbered, the Greeks held back the Persian advance for seven days. Leonidas, the Spartan King commanding the army, held up the enemy in one of the most famous last stands of history. The resistance of the Spartan-led army offered Athens the invaluable opportunity to make battle preparations and decisively defeat the Persians at the battles of Salamis. The final blow was delivered at Plataea, ending the Persian invasion of Greece and marking the rise of the Athenian Empire as a political and cultural world power. The performance of the defenders at the battle of Thermopylae is often used as an example of the advantages of training, equipment and good use of terrain to maximise an army's potential, as well as a symbol of courage against overwhelming odds.

Answer 2

480 BC

Answer 3

need more details