The two monuments.
Inscriptions on them.

At length he returned to the bridge, where he found the preparations for the movement of the fleet and of the army nearly completed. He determined, before leaving the Asiatic shores, to erect a monument to commemorate his expedition, on the spot from which he was to take his final departure. He accordingly directed two columns of white marble to be reared, and inscriptions to be cut upon them, giving such particulars in respect to the expedition as it was desirable thus to preserve. These inscriptions contained his own name in very conspicuous characters as the leader of the enterprise; also an enumeration of the various nations that had contributed to form his army, with the numbers which each had furnished. There was a record of corresponding particulars, too, in respect to the fleet. The inscriptions were the same upon the two columns, except that upon the one it was written in the Assyrian tongue, which was the general language of the Persian empire, and upon the other in the Greek. Thus the two monuments were intended, the one for the Asiatic, and the other for the European world.

The troops cross the bridge.
Movements of the fleet.

At length the day of departure arrived. The fleet set sail, and the immense train of the army put itself in motion to cross the bridge.[H] The fleet went on through the Bosporus to the Euxine, and thence along the western coast of that sea till it reached the mouths of the Danube. The ships entered the river by one of the branches which form the delta of the stream, and ascended for two days. This carried them above the ramifications into which the river divides itself at its mouth, to a spot where the current was confined to a single channel, and where the banks were firm. Here they landed, and while one part of the force which they had brought were occupied in organizing guards and providing defenses to protect the ground, the remainder commenced the work of arranging the vessels of the fleet, side by side, across the stream, to form the bridge.

The River Tearus.
Its wonderful sources.

In the mean time, Darius, leading the great body of the army, advanced from the Bosporus by land. The country which the troops thus traversed was Thrace. They met with various adventures as they proceeded, and saw, as the accounts of the expedition state, many strange and marvelous phenomena. They came, for example, to the sources of a very wonderful river, which flows west and south toward the Ægean Sea. The name of the river was the Tearus. It came from thirty-eight springs, all issuing from the same rock, some hot and some cold. The waters of the stream which was produced by the mingling of these fountains were pure, limpid, and delicious, and were possessed of remarkable medicinal properties, being efficacious for the cure of various diseases. Darius was so much pleased with this river, that his army halted to refresh themselves with its waters, and he caused one of his monuments to be erected on the spot, the inscription of which contained not only the usual memorials of the march, but also a tribute to the salubrity of the waters of this magical stream.

The cairn.

At one point in the course of the march through Thrace, Darius conceived the idea of varying the construction of his line of monuments by building a cairn. A cairn is a heap of stones, such as is reared in the mountains of Scotland and of Switzerland by the voluntary additions of every passer by, to commemorate a spot marked as the scene of some accident or disaster. As each guide finishes the story of the incident in the hearing of the party which he conducts, each tourist who has listened to it adds his stone to the heap, until the rude structure attains sometimes to a very considerable size. Darius, fixing upon a suitable spot near one of his encampments, commanded every soldier in the army to bring a stone and place it on the pile. A vast mound rose rapidly from these contributions, which, when completed, not only commemorated the march of the army, but denoted, also, by the immense number of the stones entering into the composition of the pile, the countless multitude of soldiers that formed the expedition.

Primitive mode of census-taking.