Training~ When the Greeks won the battles against the Persian Empire they trained every day of for on-land combat. Also, Athens trained very well for on-water battle. Whereas The Persian Empire did not train for on-water combat, only on-land combat , they did not have the correct weapons for fighting against Sparta whose only devotion is to war. Like in the Battle of Salamis, the Persians were not prepared for what was coming their way or trained well enough for on-water combat.
'A slave's life is all you understand, you know nothing of freedom. For if you did, you would have encouraged us to fight on, not only with our spear, but with everything we have.'