Battle of Thermopylae

What happened

Xerxes' Persian invasion (480 BCE) saw Greek city-states send forces to hold the mountain pass at Thermopylae. Leonidas led 7,000 Greeks (including 300 elite Spartan hoplites). They held the pass against repeated Persian assaults for three days. A mountain path allowed Persians to outflank the Greeks; Leonidas sent most Greeks to safety and stayed with 300 Spartans to cover the retreat. They fought to the death. Though the Greeks ultimately lost, the stand inspired Greek resistance. Salamis and Plataea followed weeks later, breaking Persian invasion. Leonidas and his men died; perhaps 20,000 Persians.

Why it mattered

Thermopylae became the paradigm of courage against overwhelming odds. Leonidas and the 300 Spartans were mythologized as heroes willing to die for freedom. The stand's sacrifice inspired Greek resistance and demonstrated that small, disciplined forces could resist much larger armies. Thermopylae shaped how the West views military heroism and sacrifice. Modern military units invoke Thermopylae's imagery of last stands and noble death. The battle's actual strategic impact was modest (Greeks lost), but its psychological and narrative impact was enormous. Thermopylae remains a symbol of resistance against imperial domination.