[Footnote H: See Frontispiece.]
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.
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.
There was a story told to Darius, as he was traversing these regions, of a certain king, reigning over some one of the nations that occupied them, who wished to make an enumeration of the inhabitants of his realm. The mode which he adopted was to require every man in his dominions to send him an arrow head. When all the arrow heads were in, the vast collection was counted by the official arithmeticians, and the total of the population was thus attained. The arrow heads were then laid together in a sort of monumental pile. It was, perhaps, this primitive mode of census-taking which suggested to Darius the idea of his cairn.
There was a tribe of barbarians through whose dominions Darius passed on his way from the Bosporus to the Danube, that observed a custom in their religious worship, which, though in itself of a shocking character, suggests reflections of salutary influence for our own minds. There is a universal instinct in the human heart, leading it strongly to feel the need of help from an unseen and supernatural world in its sorrows and trials; and it is almost always the case that rude and savage nations, in their attempts to obtain this spiritual aid, connect the idea of personal privation and suffering on their part, self inflicted if necessary, as a means of seeking it. It seems as if the instinctive conviction of personal guilt, which associates itself so naturally and so strongly in the minds of men with all conceptions of the unseen world and of divine power, demands something like an expiation as an essential prerequisite to obtaining audience and acceptance with the King of Heaven. The tribe of savages above referred to manifested this feeling by a dreadful observance. Once in every five years they were accustomed to choose by lot, with solemn ceremonies, one of their number, to be sent as a legate or embassador to their god. The victim, when chosen, was laid down upon the ground in the midst of the vast assembly convened to witness the rite, while officers designated for the purpose stood by, armed with javelins. Other men, selected for their great personal strength, then took the man from the ground by the hands and feet, and swinging him to and fro three times to gain momentum, they threw him with all their force into the air, and the armed men, when he came down, caught him on the points of their javelins. If he was killed by this dreadful impalement, all was right. He would bear the message of the wants and necessities of the tribe to their god, and they might reasonably expect a favorable reception. If, on the other hand, he did not die, he was thought to be rejected by the god as a wicked man and an unsuitable messenger. The unfortunate convalescent was, in such cases, dismissed in disgrace, and another messenger chosen.
The army of Darius reached the banks of the Danube at last, and they found that the fleet of the Ionians had attained the point agreed upon before them, and were awaiting their arrival. The vessels were soon arranged in the form of a bridge across the stream, and as there was no enemy at hand to embarrass them, the army soon accomplished the passage. They were now fairly in the Scythian country, and immediately began their preparations to advance and meet the foe. Darius gave orders to have the bridge broken up, and the galleys abandoned and destroyed, as he chose rather to take with him the whole of his force, than to leave a guard behind sufficient to protect this shipping. These orders were about to be executed, when a Grecian general, who was attached to one of the bodies of troops which were furnished from the provinces of Asia Minor, asked leave to speak to the king. The king granted him an audience, when he expressed his opinion as follows:
"It seems to me to be more prudent, sire, to leave the bridge as it is, under the care of those who have constructed it, as it may be that we shall have occasion to use it on our return. I do not recommend the preservation of it as a means of securing a retreat, for, in case we meet the Scythians at all, I am confident of victory; but our enemy consists of wandering hordes who have no fixed habitation, and their country is entirely without cities or posts of any kind which they will feel any strong interest in defending, and thus it is possible that we may not be able to find any enemy to combat. Besides, if we succeed in our enterprise as completely as we can desire, it will be important, on many accounts, to preserve an open and free communication with the countries behind us."
The king approved of this counsel, and countermanded his orders for the destruction of the bridge. He directed that the Ionian forces that had accompanied the fleet should remain at the river to guard the bridge. They were to remain thus on guard for two months, and then, if Darius did not return, and if they heard no tidings of him, they were at liberty to leave their post, and to go back, with their galleys, to their own land again.
Two months would seem to be a very short time to await the return of an army going on such an expedition into boundless and trackless wilds. There can, however, scarcely be any accidental error in the statement of the time, as the mode which Darius adopted to enable the guard thus left at the bridge to keep their reckoning was a very singular one, and it is very particularly described. He took a cord, it is said, and tied sixty knots in it. This cord he delivered to the Ionian chiefs who were to be left in charge of the bridge, directing them to untie one of the knots every day. When the cord should become, by this process, wholly free, the detachment were also at liberty. They might thereafter, at any time, abandon the post intrusted to them, and return to their homes.
We can not suppose that military men, capable of organizing a force of seventy thousand troops for so distant an expedition, and possessed of sufficient science and skill to bridge the Bosporus and the Danube, could have been under any necessity of adopting so childish a method as this as a real reliance in regulating their operations. It must be recollected, however, that, though the commanders in these ancient days were intelligent and strong-minded men, the common soldiers were but children both in intellect and in ideas; and it was the custom of all great commanders to employ outward and visible symbols to influence and govern them. The sense of loneliness and desertion which such soldiers would naturally feel in being left in solitude on the banks of the river, would be much diminished by seeing before them a marked and definite termination to the period of their stay, and to have, in the cord hanging up in their camp, a visible token that the remnant of time that remained was steadily diminishing day by day; while, in the mean time, Darius was fully determined that, long before the knots should be all untied, he would return to the river.