page_title: Battle of Thermopylae
section_title: Third day
hierarchical_section_title: Battle of Thermopylae / Battle / Third day
caption_attribution_description: English: Battle of Thermopylae Spartans and Persians
context_page_description: The Battle of Thermopylae was fought between an alliance of Greek city-states, led by King Leonidas I of Sparta, and the Achaemenid Empire of Xerxes I over the course of three days, during the second Persian invasion of Greece. It took place simultaneously with the naval battle at Artemisium, in August or September 480 BC, at the narrow coastal pass of Thermopylae. The Persian invasion was a delayed response to the defeat of the first Persian invasion of Greece, which had been ended by the Athenian victory at the Battle of Marathon in 490 BC. By 480 BC Xerxes had amassed a massive army and navy, and set out to conquer all of Greece. The Athenian politician and general Themistocles had proposed that the allied Greeks block the advance of the Persian army at the pass of Thermopylae, and simultaneously block the Persian navy at the Straits of Artemisium.
  A Greek force of approximately 7,000 men marched north to block the pass in the middle of 480 BC. The Persian army, alleged by the ancient sources to have numbered over one million, but today considered to have been much smaller arrived at the pass in late August or early September.
context_section_description: At daybreak on the third day, the Phocians guarding the path above Thermopylae became aware of the outflanking Persian column by the rustling of oak leaves. Herodotus says they jumped up and were greatly amazed. Hydarnes was perhaps just as amazed to see them hastily arming themselves as they were to see him and his forces. He feared they were Spartans but was informed by Ephialtes that they were not. The Phocians retreated to a nearby hill to make their stand (assuming the Persians had come to attack them). However, not wishing to be delayed, the Persians merely shot a volley of arrows at them, before bypassing them to continue with their encirclement of the main Greek force.
  Learning from a runner that the Phocians had not held the path, Leonidas called a council of war at dawn. According to Diodorus, a Persian called Tyrrhastiadas, a Cymaean by birth, warned the Greeks. Some of the Greeks argued for withdrawal, but Leonidas resolved to stay at the pass with the Spartans. Upon discovering that his army had been encircled, Leonidas told his allies that they could leave if they wanted to. While many of the Greeks took him up on his offer and fled, around two thousand soldiers stayed behind to fight and die. Knowing that the end was near, the Greeks marched into the open field and met the Persians head-on. Many of the Greek contingents then either chose to withdraw (without orders) or were ordered to leave by Leonidas (Herodotus admits that there is some doubt about which actually happened). The contingent of 700 Thespians, led by their general Demophilus, refused to leave and committed themselves to the fight. Also present were the 400 Thebans and probably the helots who had accompanied the Spartans.
  Leonidas' actions have been the subject of much discussion. It is commonly stated that the Spartans were obeying the laws of Sparta by not retreating. It has also been proposed that the failure to retreat from Thermopylae gave rise to the notion that Spartans never retreated. It has also been suggested that Leonidas, recalling the words of the Oracle, was committed to sacrificing his life in order to save Sparta.
  The most likely theory is that Leonidas chose to form a rearguard so that the other Greek contingents could get away. If all the troops had retreated, the open ground beyond the pass would have allowed the Persian cavalry to run the Greeks down. If they had all remained at the pass, they would have been encircled and would eventually have all been killed. By covering the retreat and continuing to block the pass, Leonidas could save more than 3,000 men, who would be able to fight again.
  The Thebans have also been the subject of some discussion. Herodotus suggests they were brought to the battle as hostages to ensure the good behavior of Thebes. However, as Plutarch long ago pointed out, if they were hostages, why not send them away with the rest of the Greeks? The likelihood is that these were the Theban "loyalists", who unlike the majority of their fellow citizens, objected to Persian domination. They thus probably came to Thermopylae of their own free will and stayed to the end because they could not return to Thebes if the Persians conquered Boeotia. The Thespians, resolved as they were not to submit to Xerxes, faced the destruction of their city if the Persians took Boeotia.
  However, this alone does not explain the fact that they remained; the remainder of Thespiae was successfully evacuated before the Persians arrived there. It seems that the Thespians volunteered to remain as a simple act of self-sacrifice, all the more amazing since their contingent represented every single hoplite the city could muster. This seems to have been a particularly Thespian trait – on at least two other occasions in later history, a Thespian force would commit itself to a fight to the death.
  At dawn, Xerxes made libations, pausing to allow the Immortals sufficient time to descend the mountain, and then began his advance. A Persian force of 10,000 men, comprising light infantry and cavalry, charged at the front of the Greek formation
caption: Spartans surrounded by Persians, Battle of Thermopylae. 19th century illustration.
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