287 and 292, and Major Rawlinson's Comments.)] 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 returned: a 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 vigour. 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. That the real supreme authority was given to Datis alone is probable, 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 against the Persians immediately before Darius obtained the throne. Datis received instructions to complete the subjugation of Greece, and especial orders were given him with regard to Eretria and Athens. He was to take these two cities; and he was to lead the inhabitants away captive, and bring them as slaves into the presence of the Great King.