Leonidas Falls at Thermopylae: Sparta's Last Stand

King Leonidas of Sparta chose to die. When a Greek traitor revealed a mountain path that would allow the Persian army to encircle the defenders at Thermopylae, most of the allied Greek force withdrew. Leonidas stayed with his 300 Spartans, 700 Thespians, and roughly 400 Thebans to hold the narrow coastal pass against an army that ancient sources numbered in the millions, though modern historians estimate at 100,000 to 300,000. They fought knowing they would not survive. The battle took place in August 480 BC during the second Persian invasion of Greece. King Xerxes I had assembled the largest military force the ancient world had ever seen to avenge his father Darius's defeat at Marathon ten years earlier and to conquer the quarrelsome Greek city-states once and for all. The narrow pass at Thermopylae, between the mountains and the sea, was the best defensive position in central Greece. For two days, the Greeks held the pass against repeated Persian assaults, their heavy armor and superior close-combat training proving devastating in the confined terrain. The breakthrough came from betrayal. A local Greek named Ephialtes informed Xerxes of the Anopaea path, a mountain trail that bypassed the pass entirely. Xerxes sent his elite Immortals along the route overnight. When Leonidas learned the Persians were behind him, he dismissed most of the allied forces and prepared for a final stand. The reasons for his decision remain debated — a Spartan prophecy, strategic calculation to cover the retreat, or simple warrior ethos — but the result was the same. The Spartans and their allies fought to the last man on the third day, buying time for the Greek fleet to withdraw from nearby Artemisium and regroup at Salamis. Leonidas's sacrifice did not stop the Persian advance but gave Greece the time it needed. The naval victory at Salamis the following month turned the invasion, and the Persian army was destroyed at Plataea in 479 BC. The stand at Thermopylae became the founding myth of Western resistance against overwhelming odds.