Further confusing the issue is Diodorus’s ambiguity about whether his 1,000 Lacedemonians include the 300 Spartans. At one point he says: “Leonidas, when he received the appointment, announced that only one thousand men should follow him on the campaign”. However, he then says that: “There were, then, of the Lacedaemonians one thousand, and with them three hundred Spartiates”. It is therefore impossible to be clearer on this point.
Pausanias’ account agrees with that of Herodotus (whom he probably read) except that he gives the number of Locrians, which Herodotus declined to estimate. Residing in the direct path of the Persian advance, they gave all the fighting men they had; according to Pausanias 6,000 men, which added to Herodotus’ 5,200 would have given a force of 11,200.
Many modern historians, who usually consider Herodotus more reliable, add the 1,000 Lacedaemonians and the 900 Helots to Herodotus’ 5,200 to obtain 7,100 or about 7,000 men as a standard number, neglecting Diodorus’ Melians and Pausanias’ Locrians. However, this is only one approach, and many other combinations are plausible. Furthermore, the numbers changed later on in the battle when most of the army retreated and only approximately 3,000 men remained (300 Spartans, 700 Thespians, 400 Thebans, probably 900 helots and 1,000 Phocians stationed above the pass; less the casualties sustained in the previous days).
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Strategic and tactical considerations
From a strategic point of view, by defending Thermopylae, the Allies were making the best possible use of their forces. As long as they could prevent further Persian advance into Greece, they had no requirement to seek a decisive battle, and could thus remain on the defensive. Moreover, by defending two constricted passages (Thermopylae and Artemisium), the Allies’ inferior numbers became less problematic. Conversely, for the Persians the problem of supplying such a large army meant that the Persians could not remain in the same place for too long. The Persians must therefore retreat or advance; and advancing required the pass of Thermopylae to be forced.
Tactically, the pass at Thermopylae was ideally suited to the Greek style of warfare. A hoplite phalanx would be able to block the narrow pass with ease, with no risk of being outflanked by cavalry. In the pass, the phalanx would have been very difficult to assault for the more lightly armed Persian infantry. The major weak point for the Allies was the mountain track which led across the highland parallel to Thermopylae, and which would allow their position to be outflanked. Although probably unsuitable for cavalry, this path could easily be traversed by the Persian infantry (many of whom were versed in mountain warfare). Leonidas was made aware of this path by local people from Trachis, and he positioned a detachment of Phocian troops there in order to block this route.
Topography of the battlefield
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Map of Thermopylae area with modern shoreline and reconstructed shoreline of 480 BC
At the time, the pass of Thermopylae consisted of a track along the shore of the Gulf of Malis so narrow that only one chariot could pass through at a time. On the southern side of the track stood the cliffs that overlooked the pass, and on the north side was the gulf of Malea. Along the path itself was a series of three constrictions, or “gates” (pylai), and at the center gate a short wall that had been erected by the Phocians in the previous century to aid in their defense against Thessalian invasions. The name “Hot Gates” comes from the hot springs that were located there.
Today, the pass is not near the sea but is several miles inland because of sedimentation in the Gulf of Malis. The old track appears at the foot of hills around the plain, flanked by a modern road. Recent core samples indicate that the pass was only 100 meters wide and the waters came up to the gates; “Little do the visitors realize that the battle took place across the road from the monument.” The pass still is a natural defensive position to modern armies, and British Commonwealth forces in World War II made a defense in 1941 against the Nazi invasion meters from the original battle field.
- Maps of the region:
- Image of the battlefield, from the east:
Battle
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First day
Greek phalanx based on sources from The Perseus Project.
On the fifth day after the Persian arrival at Thermopylae (which would become the first day of the battle), Xerxes finally resolved to attack the Allies. First of all he sent Medes and Cissians against the Allies, to take them prisoner and bring them before him. They soon found themselves launching a frontal assault on the Greek position. The Allies fought in front of the Phocian wall, at the narrowest part of the pass. Details of the tactics are scant; Diodorus says “the men stood shoulder to shoulder” and the Greeks were “superior in valor and in the great size of their shields.” This is probably describing the standard Greek phalanx, in which the men formed a wall of overlapping shields and layered spear points, which would have been highly effective as long as it spanned the width of the pass. The wicker shields and shorter spears of the Persians prevented them from effectively engaging the Greek hoplites. Herodotus says that the units for each city were kept together; units were rotated in and out of the battle to prevent fatigue, which implies the Greeks had more men than necessary to block the pass. The Greeks killed so many Medes that Xerxes is said to have started up off the seat from which he was watching the battle three times. According to Ctesias, the first wave was “cut to ribbons” with only two or three Spartans dead.
According to Herodotus and Diodorus, the king, having taken the measure of the enemy, threw his best troops into a second assault the same day: the Immortals, an elite corps of 10,000 men. However, the Immortals fared no better than the Medes had, failing to make headway against the Allies. The Spartans apparently used a tactic of feigning retreat, and then turning on, and killing the enemy troops when they ran after the Spartans.
Second day
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Depiction of Persian warriors, probably the Immortals.
On the second day, Xerxes again sent in the infantry to attack the pass, “supposing that their enemies, being so few, were now disabled by wounds and could no longer resist.” However, the Persians fared no better on the second day than on the first. Xerxes at last stopped the assault and withdrew to his camp, totally perplexed.
Late on the second day of battle, however, as the Persian king was pondering what to do next, he received a windfall; a Trachinian traitor named Ephialtes informed him of the mountain path around Thermopylae and offered to guide the Persian army. Ephialtes was motivated by the desire of a reward. For this act, the name of Ephialtes received a lasting stigma, his name coming to mean “nightmare” and becoming the archetypal term for a “traitor” in Greek.
Herodotus reports that Xerxes sent his commander Hydarnes that evening, with the men under his command, the Immortals, to encircle the Allies via the path. However, he does not say who those men are. The Immortals had been bloodied on the first day, so it is possible that Hydarnes may have been given overall command of an enhanced force including what was left of the Immortals, and indeed, according to Diodorus, Hydarnes had a force of 20,000 for the mission. The path led from east of the Persian camp along the ridge of Mt. Anopaea behind the cliffs that flanked the pass. It branched with one path leading to Phocis and the other down to the Gulf of Malis at Alpenus, first town of Locris.
Third Day
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Leonidas at Thermopylae, by Jacques Louis David, 1814. This is a juxtaposition of various historical and legendary elements from the Battle of Thermopylae.
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 that 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 the Persian forces. He feared that they were Spartans but was informed by Ephialtes that they were not. The Phocians retreated to a nearby hill to make their stand (assuming that the Persians had come to attack them). However, not wishing to be delayed, the Persians gave them a volley of arrows, before passing by to continue with their encirclement of the main Allied force.
Learning from a runner that the Phocians had not held the path, Leonidas called a council of war at dawn. Some of the Allies argued for withdrawal, but Leonidas resolved to stay at the pass with the Spartans. Many of the Allied contingents then either choose 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 with the other Greeks but committed themselves to the fight. Also present were the 400 Thebans, and probably the helots that had accompanied the Spartans.
Leonidas’s actions have been the subject of much discussion. It is commonly stated that the Spartans were obeying the laws of Sparta by not retreating, but it seems it was actually the failure to retreat from Thermopylae that gave rise to the notion that Spartans never retreated. It is also possible that recalling the words of the Oracle, Leonidas was committed to sacrifice his life in order to save Sparta. However, since the prophecy was specific to him, this seems a poor reason to commit c. 1,500 other men to a fight to the death. The most likely theory is that Leonidas chose to form a rearguard so that the other Allied 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 at some later point. The Thebans have also been the subject of some discussion. Herodotus suggests that they were brought to the battle as hostages to ensure the good behaviour of Thebes. However, as Plutarch long ago pointed out, if they were hostages, why not send them away with the rest of the Allies? The likelihood is that these were the Theban ‘loyalists’, who unlike the majority of the fellow citizens, objected to Persian domination. They thus probably came to Thermopylae of their own free will, and stayed at 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 their 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.
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At dawn Xerxes made libations, pausing to allow the Immortals sufficient time to descend the mountain, and then began his advance. The Allies this time sallied forth from the wall to meet the Persians in the wider part of the pass in an attempt to slaughter as many Persians as they could. They fought with spears until every spear was shattered and then switched to xiphe (short swords). In this struggle, Herodotus states that two brothers of Xerxes fell: Abrocomes and Hyperanthes. Leonidas also died in the assault, and the two sides fought over his body, the Greeks taking possession. As the Immortals approached, the Allies withdrew and took a stand on a hill behind the wall. The Thebans “moved away from their companions, and with hands upraised, advanced toward the barbarians…” (Rawlinson translation), but a few were slain before their surrender was accepted. The king later had the Theban prisoners branded with the royal mark. Of the remaining defenders, Herodotus says:
“Here they defended themselves to the last, those who still had swords using them, and the others resisting with their hands and teeth.”
Tearing down part of the wall, Xerxes ordered the hill surrounded, and the Persians rained down arrows until every last Greek was dead. In 1939, archaeologist Spyridon Marinatos, excavating at Thermopylae, found large numbers of Persian bronze arrowheads on Kolonos Hill, changing the identification of the hill on which the Allies died from a smaller one nearer the wall.
The pass at Thermopylae was thus opened to the Persian army. According to Herodotus, at the cost to the Persians of up to 20,000 fatalities. The Allied rearguard meanwhile, was annihilated, with a probable loss of 2,000 men, including those killed on the first two days of battle. Herodotus says at one point that 4,000 Allies died, but assuming that the Phocians guarding the track were not killed during the battle (as Herodotus implies), this would be almost every Allied soldier present (by Herodotus’s own estimates), and this number is probably too high.
Aftermath
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Main article: Second Persian invasion of Greece
When the body of Leonidas was recovered by the Persians, Xerxes, in a rage against Leonidas, ordered that the head be cut off and the body crucified. Herodotus observes that this was very uncommon for the Persians, as they had the habit of treating “valiant warriors” with great honor (the example of Pytheas, captured off Skiathos before the Battle of Artemisium strengthens this suggestion). However, Xerxes was known for his rage, for instance, when he had the Hellespont whipped because it would not obey him. After the Persians’ departure, the Allies collected their dead and buried them on the hill. After the Persian invasion ended, a stone lion was erected at Thermopylae to commemorate Leonidas. A full forty years after the battle, Leonidas’ bones were returned to Sparta where he was buried again with full honors; funeral games were held every year in his memory.
With Thermopylae now opened to the Persian army, the continuation of the blockade at Artemisium by the Allied fleet became irrelevant. The simultaneous naval Battle of Artemisium had been a tactical stalemate, and the Allied navy was able to retreat in good order to the Saronic Gulf where they helped to ferry the remaining Athenian citizens across to the island of Salamis.
Following Thermopylae, the Persian army proceeded to burn and sack the Boeotian cities which had not submitted to the Persians, Plataea and Thespiae; before marching on the now evacuated city of Athens. Meanwhile, the Allies (for the most part Peloponnesian) prepared to defend the Isthmus of Corinth, demolishing the single road that led through it, and building a wall across it. As at Thermopylae, to make this an effective strategy required the Allied navy to stage a simultaneous blockade, barring the passage of the Persian navy across the Saronic Gulf, so that troops could not be landed directly on the Peloponnese. However, instead of a mere blockade, Themistocles persuaded the Allies to seek a decisive victory against the Persian fleet. Luring the Persian navy into the Straits of Salamis, the Allied fleet was able to destroy much of the Persian fleet in the Battle of Salamis, which essentially ended the threat to the Peloponnese.
Fearing that the Greeks might attack the bridges across the Hellespont and trap his army in Europe, Xerxes now retreated with much of the army back to Asia. He left a hand picked force under Mardonius to complete the conquest the following year. However, under pressure from the Athenians, the Peloponnesian Allies eventually agreed to try and force Mardonius to battle, and marched on Attica. Mardonius retreated to Boeotia to lure the Greeks into open terrain and the two sides eventually met near the city of Plataea. There, at the Battle of Plataea the Greek army won a decisive victory, destroying much of the Persian army, and ending the invasion of Greece. Meanwhile, at the near-simultaneous naval Battle of Mycale they also destroyed much of the remaining Persian fleet, thereby reducing the threat of further invasions.
Significance
Thermopylae is arguably the most famous battle in European ancient history, repeatedly referenced in ancient, recent and contemporary culture. In western culture at least, it is the Greeks who are lauded for their performance in battle.
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However, within the context of the Persian invasion, Thermopylae was undoubtedly a defeat for the Allies, and one with disastrous consequences. Whatever the Allies may have intended, it was presumably not their strategy to surrender all of Boeotia and Attica to the Persians. Thus, modern portrayals of Thermopylae as a successful delaying action, which gave the Allied navy time to prepare for the Battle of Salamis, or suggestions that the Persian casualties were so severe that they lost all heart (i.e., the Persians won a Pyhrric victory), are probably not sustainable. The theory that Thermopylae bought the Allies time to prepare for Salamis ignores the fact that the Allied navy was at the same time fighting and sustaining losses at the Battle of Artemisium; moreover, compared to the probable gap between Thermopylae and Salamis, the length of time for which the Allied army held up the Persian army was not particularly significant. It seems clear that the Allied strategy was to hold off the Persians at Thermopylae and Artemisium, and that by failing to do so, they suffered a severe defeat. The Greek position at Thermopylae, despite being massively out-numbered, was near-impregnable. If the position had been held for even slightly longer, the Persians may have had to retreat for lack of food and water. Thus, despite the heavy losses, forcing the pass was a clear Persian victory, both tactically and strategically. The successful retreat of the bulk of the Greek troops, though morale-boosting, was in no sense a victory, though it did take some of the sheen off the Persian victory.
The fame of Thermopylae is thus prin