118 HISTORICAL TALES. Happy was it for Greece that the ambitious Persian did not then seek its conquest, as Democedes, his physician, had suggested. The Athenians, then under the rule of the tyrant Pisistratus, were not the free and bold people they afterwards became, and had Darius sought their conquest at that time, the land of Greece would probably have become a part of the overgrown Persian empire. Fortunately, he was bent on conquering the barbarians of the north, and left Greece to grow in valor and pa- triotism. While the army marched from Asia into Europe across its bridge of boats, the fleet was sent into the Euxine, or Black Sea, with orders to sail for two days up the Danube River, which empties into that sea, and build there also a bridge of boats. When Darius with his army reached the Danube, he found the bridge ready, and on its swaying length crossed what was then believed to be the greatest river on the earth. Reaching the northern bank, he marched onward into the unknown country of the barbarous Scythians, with visions of conquest and glory in his mind. What happened to the great Persian army and its ambitious leader in Scythia we do not very well know. Two historians tell us the story, but prob- ably their history is more imagination than fact. Ctesias tells the fairy-tale that Darius marched northward for fifteen days, that he then exchanged bows with the Scythian king, and that, finding the Scythian bow to be the largest, he fied back in terror to the bridge, which he hastily crossed, having left