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. 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