The Battle of Artemesium was a 3-day naval action by the combined fleet of the Greek coalition against the enormous naval forces of the Persian Empire.
The battle took place in 480 BC during the Second Persian Invasion of Greece, on the same three days as the Battle of Thermopylae.
The Greeks were victorious due to clever maneuvering and a fortuitous storm that wrecked a large detachment of the Persian fleet that was rounding Euboea to encircle the Greek fleet.
Source: http://classics.mit.edu/Herodotus/history.8.viii.html
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