The document provides an overview of the Persian Wars between Greece and the Persian Empire. It describes how the Spartans and 300 soldiers held off the massive Persian invasion force at the Battle of Thermopylae. It then discusses how the Athenians, following the advice of Themistocles, evacuated the city by sea and defeated the Persian navy at the Battle of Salamis. This victory ended the Persian threat and allowed the Greek city-states to gain freedom and confidence. Athens in particular entered a Golden Age of cultural and intellectual achievement under the leadership of Pericles.