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I got this idea after watching "The 300 Spartans" (the original & more historically accurate version from 1962). The reason there were only 300 Spartans at Thermopylae was because a religious festival was close and then the council decided to fortify the Isthmus of Corinth instead of Themopylae. The 300 at Thermopylae were King Leonidas's personal bodyguard.
What if there hadn't been a religious festival approaching or what if the Council had sent the rest of Sparta's army? Could the Persians have been turned completely back (like having Spartans defend the goat path)?
I'd like to hear possibilities other than not having the tale of the Last Stand of the 300 Spartans.