Postby William Ames » Sat Feb 25, 2006 2:21 pm
There were 300 Spartans, 900 Helots, who were Spartan slaves, and 600 Thespians, for a total of 1800 men guarding Thermopylae after the majority of the army retreated.
As an interesting sidenote, the Spartans were impressed by the Thespians, who were all citizen soldiers, electing to remain behind with the Spartans, who were professionals. The Spartans gave the Thespians the signature Spartan red cloaks to wear during the battle, which possibly led to some confusion. The Spartan-Thespian alliance, forged as a consequence of this battle, proved to be one of the most lasting in the Greek world.
As to the Persians, Herodutus's numbers are generally considered exaggerated, but not to the same degree as Medieval historians. The Persian army almost certainly was in the one hundered to two hundered thousand range. The vast majority of them never made it into battle because of the narrowness of the pass. When one considers the size of the Persian Empire, and the amount of time spent preparing for this invasion, it's not at all unbeleivable.