Why couldnt the entire Spartan army march north to help militades at marathon?

why couldnt the entire Spartan army march north to help militades at marathon or Leonidas at thermopylae or:why couldnt the entire Spartan army march

why couldnt the entire Spartan army march north to help militades at marathon or Leonidas at thermopylae

or:why couldnt the entire Spartan army march north to help militades at marathon or Leonidas at thermopylae

or:www.historynet.com/battle-of-marathon-greeks-versus-the-persians.htmwww.livius.org/articles/battle/marathon-490-bce/the-significance-of-marathon/

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