Greece in the 5th century BC BC, the Greeks, under the Spartan Pausanias, defeated the Persian army at Plataea. The Athenian fleet then turned to chasing the Persians out of the Aegean Sea, defeating their fleet decisively in the Battle of Cape Mycale, and in 478 BC the Athenian fleet captured Byzantium. In the course of doing so Athens enrolled all the island states and some mainland allies into an alliance, called the Delian League because the League's treasury was kept on the sacred island of Delos. The Spartans, although they had taken part in the war, withdrew from any further involvement, allowing Athens to become
Themistocles able to travel to a meeting of the Allies, at which he proposed his strategy; with the Athenian fleet fully committed to the defence of Greece, the other Allies accepted his proposals. Thus, in August 480 BC, when the Persian army was approaching Thessaly, the Allied fleet sailed to Artemisium, and the Allied army marched to Thermopylae. Themistocles himself took command of the Athenian contingent of the fleet, and went to Artemisium. When the Persian fleet finally arrived at Artemisium after a significant delay, Eurybiades, who both Herodotus and Plutarch suggest was not the most inspiring commander, wished to sail