system
Given the following post, respond as if you're commenting on Reddit:
human
[300] How long would the Spartans survive if they had not been betrayed and outflanked?
gpt
People are overlooking something crucial. The Spartans crushed everything thrown at them. 

Everything. 

Cavalry, monsters, grenades, immortals.

Xerxes had no more aces. 

He can do two things. Throw more slaves at Sparta. These slave warriors don't cause casualties. 

In fact, the longer the fight goes on, the more intimidated the slaves get.

They did and will again rout.

The Spartans don't get overrun.

It's a game of attrition, right? WRONG.

People here who have no understanding of history and the movies forget about the parallel battle going on at sea. 

Athens was battling with Persia at the same time on sea! With 50 warships.

They begun fighting while Leonidas was still going strong. They learned of his demise after they've fight battles already.

And remember what happened next in Rise of an Empire? Gorgo, the most badass woman of ancient Greece (also in actual history), wife of Leonidas, comes to join and win on sea. So, on the Sea you have Athens, Sparta, Delphi, Acadia, Olympia, Thebes. 

Leonidas is probably getting bored of slaughtering Persian slaves when the Greek armies come in to finish the job.

Ephialtes, the gollum of Sparta, ruined it big time.