The battle at Thermopylae was a long awaited battle, after both powers Athens and Persia submitted to a 10 year inter-war period from 490BC to 480BC, in order to carefully prepare a second invasion from the Persian’s, following the humiliating defeat of Darius at marathon. Xerxes actions were motivated by revenge and the urge to burn Athens to the ground, just like Sardis, however he knew it would not be easy. The Persians spent multiple years recruiting new infantry from all areas of its Empire, gathering a total of 500,000 new soldiers,archers, cavalry and inmortals for the second invasion. Not only this, but Xerxes determination to conquer the Greeks was so great he ordered his engineers to build a Poonton consisting of 314 ships crossing the Hellospont for him and his troops.
The Greeks received information regarding the numbers and desires of the Persians from spies they sent to Sardis, Xerxes headquarters. Having experience gained from previous Persian campaigns, they knew that in order to battle against such super power , they had to form alliances to fight for one common goal, despite the fact they belonged to different races and were organized into city-states. In Autum of 481 B.C. , A Pan-Hellenic meeting was held in Corinth , having 31 cities attending the meeting besides a few that did not. Unanimously Sparta was given leadership of the army and the fleet under the command of King Leonidas, although the general defense plan was commanded by the Athenian Themistocles, who foresaw the battle will be determined on the seas, if only the pass between Central to Southern Greece was guarded.
Fighting in the open land would be fatal as they lacked cavalry units and were highly outnumbered, 3 to 1. Thermopylae was the perfect site. The pass itself was narrow, situated between the sea and the steep cliffs. It had a length of about 9 km and narrows in three places: at the eastern and western ends there was room for only one carriage, while the middle section was 15 m wide. The Greeks would use this to their advantage, because it was so narrow, even with an army as big as the Persian’s had, only a small number could genuinely fight at any one time. This enables a minimal manpower to hold off enormous armies for long amounts of time, which is exactly how Spartan combat was fought.
The Hellenic Army, reached Thermopylae at the beginning of August. In total, a force of about 7000 to 8000 men was assembled. The numbers were again given by Herodotus: 300 Spartans, 700 Tegeats, 550 Mantineians, 300 from Arcadian Orchomenos, 1,000 Arcadians in general, 600 Corinthians, 460 from Phlian, 150 Mycenaeans, 800 Thespians, 450 Thebans, the complete army from Opuntion Locrain and 1,000 Phocians.
The Pass would prevent the enemy from developing his land forces while the small channel of the Evripou prevented the possibility of the Hellenic Fleet being encircled. In addition, a fortifications had been built by a 1000 Phocians to the east of the central pass of Thermopylae in Anopaia to defend the other entry. By defending the Pass the Greeks would be able to apply a withdrawal strategy and at the same time wear out the enemy and cause him serious casualties and lower his morale.
They were very fit, agile, used to marching with heavy armory, they knew the land and their weapons were heavier and more effective. The hoplite phalanx that the Spartans formed was a compact, moving metallic wall of shields and lances. In comparison to Persian armory which was minimal, soldiers wore bright robes with chain armors underneath, carried a long shield called spara and spears much shorter than the Greeks or if they were archers a caved wooden bow. Inmortals were more equipped , having a bronze armor, helmet a bronze square shield for better grip and a axe.
Thinking that the Greeks were impertinent and reckless, he sent Medes and Cissians with orders to take the Greeks prisoner and to bring them back alive. The...