The revolts of a few Greek cities of Ionia were what initially sparked the Persians interest in Athens, Attica and the Peloponnese. When Athens sent a small fleet in support of the Ionian rebels they immediately gave Persia a new target for further expansion. The failure of the revolts and the ruin of Sardis and Miletus shocked the Greek world. The Persians now thought, "if Miletus had been the glory of subject Greece, Athens was the golden gate to free Hellas. A bauble, perhaps, beside the treasures of the empire, but a tempting one." Now not only did the Persian king Darius want revenge against the Athenians he wanted the entire Greek world to be integrated into the Persian Empire.
In 490 BCE Darius finally advanced towards Greece. After the capture of Eretria, confident of their success, the Persians sailed on to Attica; and under the advice of Hippas* landed at the bay of Marathon, 26 km north east of Athens. When the Athenians received news of the Persians landing, they sent a runner (Philippides) to Sparta asking for support. They knew support would not get to them before the Persians decided to move so the Athenians then made "one of the most fateful decisions ever taken by a democratic government in ancient Greece. It was to advance and