Proceedings of the satrap Artaphernês after the reconquest of Ionia — Mardonius comes with an army into Ionia — he puts down the despots in the Greek cities. — He marches into Thrace and Macedonia — his fleet destroyed by a terrible storm near Mount Athos — he returns into Asia. — Island of Thasos — prepares to revolt from the Persians — forced to submit. — Preparations of Darius for invading Greece — he sends heralds round the Grecian towns to demand earth and water — many of them submit. — Ægina among those towns which submitted — state and relations of this island. — Heralds from Darius are put to death, both at Athens and Sparta. — Effects of this act in throwing Sparta into a state of hostility against Persia. — The Athenians appeal to Sparta, in consequence of the _medism_ (or submission to the Persians) of Ægina. — Interference of Sparta — her distinct acquisition and acceptance of the leadership of Greece. — One condition of recognized Spartan leadership was the extreme weakness of Argos at this moment. — Victorious war of Sparta against Argos. — Destruction of the Argeians by Kleomenês, in the grove of the hero Argus. — Kleomenês returns without having attacked the city of Argos. — He is tried — his peculiar mode of defence — acquitted. — Argos unable to interfere with Sparta in the affair of Ægina and in her presidential power. — Kleomenês goes to Ægina to seize the _medizing_ leaders — resistance made to him, at the instigation of his colleague Demaratus. — Demaratus is deposed, and Leotychidês chosen king, by the intrigues of Kleomenês. — Demaratus leaves Sparta and goes to Darius. — Kleomenês and Leotychidês go to Ægina, seize ten hostages, and convey them as prisoners to Athens. — Important effect of this proceeding upon the result of the first Persian invasion of Greece. — Assemblage of the vast Persian armament under Datis at Samos. — He crosses the Ægean — carries the island of Naxos without resistance — respects Delos. — He reaches Eubœa — siege and capture of Eretria. — Datis lands at Marathon. — Existing condition and character of the Athenians. — Miltiadês — his adventures — chosen one of the ten generals in the year in which the Persians landed at Marathon. — Themistoklês and Aristeidês. — Miltiadês, Aristeidês, and perhaps Themistoklês, were now among the ten stratêgi, or generals, in 490 B. C. — The Athenians ask aid from Sparta — delay of the Spartans. — Difference of opinion among the ten Athenian generals — five of them recommend an immediate battle, the other five are adverse to it. — Urgent instances of Miltiadês in favor of an immediate battle — casting-vote of the polemarch determines it. — March of the Athenians to Marathon — the Platæans spontaneously join them there. — Numbers of the armies. — Locality of Marathon. — Battle of Marathon — rapid charge of Miltiadês — defeat of the Persians. — Loss on both sides.