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Rh war, and for transports of sufficient size for carrying cavalry as well as infantry across the gan. While these preparations were being made, Darius sent heralds round to the Grecian cities demanding their submission to Persia. It was proclaimed in the market-place of each little Hellenic state (some with territories not larger than the Isle of Wight), that King Darius, the lord of all men, from the rising to the setting sun, required earth and water to be delivered to his heralds, as a symbolical acknowledgment that he was head and master of the country. Terror-stricken at the power of Persia and at the severe punishment that had recently been inflicted on the refractory Ionians, many of the continental Greeks and nearly all the islanders submitted, and gave the required tokens of vassalage. At Sparta and Athens an indignant refusal was returneda refusal which was disgraced by outrage and violence against the persons of the Asiatic heralds.

Fresh fuel was thus added to the anger of Darius against Athens, and the Persian preparations went on with renewed vigor. In the summer of 490 B.C., the army destined for the invasion was assembled in the Aleian plain of Cilicia, near the sea. A fleet of six hundred galleys and numerous transports was collected on the coast for the embarkation of troops, horse as well as foot. A Median general named Datis, and Artaphernes, the son of the satrap of Sardis, and who was also nephew of Darius, were placed in titular joint command of the expedition. The real supreme authority was probably given to Datis alone, from the way in which the Greek writers speak of him. We know no details of the previous career of this officer; but there is every reason to believe that his abilities and bravery had been proved by experience, or his Median birth would have prevented his being placed in high command by Darius. He appears to have been the first Mede who was thus trusted by the Persian kings after the overthrow of the conspiracy of the Median magi