Undismayed by this disaster, Darius issued orders for the raising and equipping of another and stronger armament. Meanwhile he sent heralds to the various Grecian states to demand earth and water, which elements among the Persians were symbols of submission. The weaker states gave the tokens required; but the Athenians and Spartans threw the envoys of the king into pits and wells, and bade them help themselves to earth and water. By the beginning of the year 490 B.C., another Persian army of 120,000 men had been mustered for the second attempt upon Greece. This armament was intrusted to the command of the experienced generals Datis and Artaphernes; but was under the guidance of the traitor Hippias. A fleet of six hundred ships bore the army from the coasts of Asia Minor over the Aegean towards the Grecian shores. After receiving the submission of the most important of the Cyclades, and capturing and sacking the city of Eretria upon the island of Euboea, the Persians landed at Marathon, barely one day's journey from Athens. Here is a sheltered bay, which is edged by a crescent-shaped plain, backed by the rugged ranges of Parnes and Pentelicus. Upon this level ground the Persian generals drew up their army, flushed and confident with their recent successes. THE BATTLE OF MARATHON (490 B.C.).--The Athenians were nerved by the very magnitude of the danger to almost superhuman energy. Slaves were transformed into soldiers by the promise of liberty. A fleet runner, Phidippides by name, was despatched to Sparta for aid. In just thirty-six hours he was in Sparta, which is one hundred and fifty miles from Athens. But it so happened that it lacked a few days of the full moon, during which interval the Spartans, owing to an old superstition, were averse to setting out upon a military expedition. They promised aid, but moved only in time to reach Athens when all was over. The Platæans, firm and grateful friends of the Athenians, on account of some former service, no sooner received the latter's appeal for help than they responded to a man. The Athenians and their faithful allies, numbering about ten thousand in all, under the command of Miltiades, were drawn up in battle array just where the hills of Pentelicus sink down into the plain of Marathon. The vast host of the Persians filled the level ground in their front. The fate of Greece and the future of Europe were in the keeping of Miltiades and his trusty warriors. Without waiting for the attack of the Persians, the Greeks charged and swept like a tempest from the mountain over the plain, pushed the Persians back towards the shore, and with great slaughter drove them to their ships. Miltiades at once despatched a courier to Athens with intelligence of his victory. The messenger reached the city in a few hours, but so breathless from his swift run that, as the people thronged eagerly around him to hear the news he bore, he could merely gasp, "Victory is ours," and fell dead.