The document summarizes the key events of the Persian Wars between Greece and Persia in the 5th century BCE. It describes the initial build up to war after Athens helped the Lydians revolt against Persian rule. It then discusses the pivotal Battle of Marathon, where vastly outnumbered Athenian forces defeated the Persians through strategy. It also outlines the formation of the Greek League led by Athens and Sparta to fight Persia. The major battles of Thermopylae, Salamis, and Plataea are summarized, culminating in the Greek victory that established their superiority and allowed Athens to flourish culturally.