The Persian War or the Persians No More?

Today in Western Civilization we learned more about the Persian Wars. It's incredible that the Greeks won! What is even more incredible is that just Athens alone beat the Persians (in the first round at least). Its crazy that some few thousand unskilled fighters beat 20,000 Persians. They even killed about 6,000 of them! I still feel a little bad for the man who ran to Sparta for help! 140 Miles for absolutely nothing! I mean, we are all aware that the Spartans don't like the Athenians but really?! Deny them help to save your country? Do you really not like them that much?! That's crazy!