One Hit Wonders ML - The B-Sides by DixonD

Question 6

What Spartan king’s only significant battle, in 480 BC at Thermopylae, was a loss to the invading Persians? His sacrifice of himself and his small army in an effort to slow down the Persians’ advance made him a hero to his fellow Greeks, who went on to defeat the Persians at Salamis later that year.

Leonidas (I)