HOW THE SPARTANS DIED AT THERMOPYLA. Wuen Xerxes, as his father had done before him, sent to the Grecian cities to demand earth and water in token of submission, no heralds were sent to Athens or Sparta. These truculent cities had flung the heralds of Darius into deep pits, bidding them to take earth and water from there and carry it to the great king. This act called for revenge, and whatever mercy he might show to the rest of Greece, Athens and Sparta were doomed in his mind to be swept from the face of the earth. How they escaped this dismal fate is what we have next to tell. As one of the great men of Athens, Miltiades, had saved his native land in the former Persian invasion, so a second patriotic citizen, Themistocles, proved her savior in the dread peril which now threatened her. But the work of Themistocles was not done in a single great battle, as at Marathon, but in years of preparation. And a war between Athens and the neighboring island of Aigina had much to do with this escape from ruin. To make war upon an island a land army was of noavail.