The place of general rendezvous for the various forces which were to join in the expedition, consisting of the army which marched with Darius from Susa, and also of the troops and ships which the maritime provinces of Asia Minor were to supply on the way, was on the shores of the Bosporus, at the point where Mandrocles had constructed the bridge.[G] The people of Ionia, a region situated in Asia Minor, on the shores of the AEgean Sea, had been ordered to furnish a fleet of galleys, which they were to build and equip, and then send to the bridge. The destination of this fleet was to the Danube. It was to pass up the Bosporus into the Euxine Sea, now called the Black Sea, and thence into the mouth of the river. After ascending the Danube to a certain point, the men were to land and build a bridge across that river, using, very probably, their galleys for this purpose. In the mean time, the army was to cross the Bosporus by the bridge which had been erected there by Mandrocles, and pursue their way toward the Danube by land, through the kingdom of Thrace. By this arrangement, it was supposed that the bridge across the Danube would be ready by the time that the main body of the army arrived on the banks of the river. The idea of thus building in Asia Minor a bridge for the Danube, in the form of a vast fleet of galleys, to be sent round through the Black Sea to the mouths of the river, and thence up the river to its place of destination, was original and grand. It strikingly marks the military genius and skill which gave the Greeks so extended a fame, for it was by the Greeks that the exploit was to be performed. [Footnote G: For the track of Darius on this expedition, see the map at the commencement of this volume.] Darius marched magnificently through Asia Minor, on his way to the Bosporus, at the head of an army of seventy thousand men. He moved slowly, and the engineers and architects that accompanied him built columns and monuments here and there, as he advanced, to commemorate his progress. These structures were covered with inscriptions, which ascribed to Darius, as the leader of the enterprise, the most extravagant praise. At length the splendid array arrived at the place of rendezvous on the Bosporus, where there was soon presented to view a very grand and imposing scene. The bridge of boats was completed, and the Ionian fleet, consisting of six hundred galleys, was at anchor near it in the stream. Long lines of tents were pitched upon the shore, and thousands of horsemen and of foot soldiers were drawn up in array, their banners flying, and their armor glittering in the sun, and all eager to see and to welcome the illustrious sovereign who had come, with so much pomp and splendor, to take them under his command. The banks of the Bosporus were picturesque and high, and all the eminences were crowded with spectators, to witness the imposing magnificence of the spectacle.