page_title: Battle of Thermopylae
section_title: First day
hierarchical_section_title: Battle of Thermopylae / Battle / First day
caption_attribution_description: English: Hoplite circa 500 BCE and Scythian soldier of the Achaemenid army circa 480 BCE
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: On the fifth day after the Persian arrival at Thermopylae and the first day of the battle, Xerxes finally resolved to attack the Greeks. First, he ordered 5,000 archers to shoot a barrage of arrows, but they were ineffective; they shot from at least 100 yards away, according to modern day scholars, and the Greeks' wooden shields (sometimes covered with a very thin layer of bronze) and bronze helmets deflected the arrows.
  After that, Xerxes sent a force of 10,000 Medes and Cissians to take the defenders prisoner and bring them before him. The Persians soon launched a frontal assault, in waves of around 10,000 men, on the Greek position. The Greeks fought in front of the Phocian wall, at the narrowest part of the pass, which enabled them to use as few soldiers as possible. Details of the tactics are scant; Diodorus says, "the men stood shoulder to shoulder", and the Greeks were "superior in valour and in the great size of their shields." This probably describes the standard Greek phalanx, in which the men formed a wall of overlapping shields and layered spear points protruding out from the sides of the shields, which would have been highly effective as long as it spanned the width of the pass. The weaker shields, and shorter spears and swords 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 stood up three times from the seat from which he was watching the battle. According to Ctesias, the first wave was "cut to ribbons", with only two or three Spartans killed in return.
  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, and failed to make any headway against the Greeks. The Spartans apparently used a tactic of feigning retreat, and then turning and killing the enemy troops when they ran after them.
caption: Contemporary depictions: probable Spartan hoplite (Vix crater, c.500 BC),[88] and Scythian warrior of the Achaemenid army[61][89] (tomb of Xerxes I, c.480 BC), at the time of the Second Persian invasion of Greece (480–479 BC).
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