Battle of Salamis
In 480 BC the Greek fleet led by Themistocles defeated Xerxes’ Persian fleet in the straits of Salamis.

Wilhelm von Kaulbach · Public domain · Source
Themistocles had used silver from the mines of Laurion to build a large fleet of triremes, turning Athens into a naval power. When Xerxes’ army broke through at Thermopylae in 480 BC and bore down on Athens, the citizens abandoned the city and took refuge on Salamis and elsewhere.
Themistocles lured the Persian fleet into the narrow straits of Salamis, where its greater numbers could not manoeuvre, and the Greek triremes rammed their way to a decisive victory. Xerxes returned home leaving part of his army behind, and the Persian land army was defeated at Plataea the next year. Because the poor citizens who rowed the ships had won the battle, their voice in the Athenian democracy grew.