(M409) We have seen how Asiatic cities were colonized by Greeks, among whom the Ionians were pre-eminent. The cities were governed by tyrants, who were sustained in their usurpation by the power of Persia, then the great power of the world. Darius, then king, had absurdly invaded Scythia, with an immense army of six hundred thousand men, to punish the people for their inroad upon Western Asia, subject to his sway, about a century before. He was followed by his allies, the tyrants of the Ionian cities, to whom he intrusted the guardianship of the bridge of boats by which he had crossed the Danube, B.C. 510. As he did not return within the time specified—sixty days—the Greeks were left at liberty to return. A body of Scythians then appeared, who urged the Greeks to destroy the bridge, as Darius was in full retreat, and thus secure the destruction of the Persian army and the recovery of their own liberty. Miltiades, who ruled the Chersonese—the future hero of Marathon, seconded the wise proposal of the Scythians, but Histiæus, tyrant of Miletus, feared that such an act would recoil upon themselves, and favor another inroad of Scythians—a fierce nation of barbarians. The result was that the bridge was not destroyed, but the further end of it was severed from the shore. Night arrived, and the Persian hosts appeared upon the banks of the river, but finding no trace of it, Darius ordered an Egyptian who had a trumpet-voice to summon to his aid Histiæus, the Milesian. He came forward with a fleet and restored the bridge, and Darius and his army were saved, and the opportunity was lost to the Ionians for emancipating themselves from the Persians. The bridge was preserved, not from honorable fidelity to fulfill a trust, but selfish regard in the despot of Miletus to maintain his power. For this service he was rewarded with a principality on the Strymon. Exciting, however, the suspicion of Darius, by his intrigues, he was carried captive to the Persian court, but with every mark of honor. Darius left his brother Artaphernes as governor of all the cities in Western Asia Minor.