Leonidas and the 300 Spartans

S1 E6: Legend versus History at Day 3 of Thermopylae. The sacrifice of Leonidas, his 300 Spartans and other Greeks, trying to delay the enormous Persian forces of King Xerxes. What really happened there? Were the 300 Spartans on a suicide mission? The evacuation of Athens and Themistocles brings on the first naval battle in the Bay of Salamis.