The Spartan Navy on the other hand was extremely small as a result of there being no main bodies of water nearby, and was instead used mainly for means of transporting the army. Those who proved incapable of completing their training were, “publicly disgraced and denied the status of being an Alike,” (Hunt, 65). Unlike Spartan practice, Athenian boys were required to attend only two years of military school once they reached the age of eighteen. Again, unlike the Spartans, Athenian power was tied directly to their naval superiority. The incorporation of triremes, warships rowed by 170 men on three levels and equipped with a sturdy battering ram at the bow, lent to their power overseas and their ability to prevent an enemy from reaching their shores. The Athenians used these Triremes and the rest of their navy effectively in repelling Persian invasions and expelling them entirely for a period of up to fifty