Darius appears to have formed this project of conquest immediately after his first victories, when his initial attempts to institute satrapies had taught him not only the condition and needs of Asia Minor, but of the teaching the Scythians such a lesson as would prevent them from bearing down upon his right flank during his march, or upon his rear while engaged in a crucial struggle in the Hellenic peninsula. On the other hand, the geographical information possessed by the Persians with regard to the Danubian regions was of so vague a character, that Darius must have believed the Scythians to have been nearer to his line of operations, and their country less desolate than was really the case.* A flotilla, commanded by Ariaramnes, satrap of Cappadocia, ventured across the Black Sea in 515,** landed a few thousand men upon the opposite shore, and brought back prisoners who furnished those in command with the information they required.*** * The motives imputed to Darius by the ancients for making this expedition are the desire of avenging the disasters of the Scythian invasion, or of performing an exploit which should render him as famous as his predecessors in the eyes of posterity. ** The reconnaissance of Ariaramnes is intimately connected with the expedition itself in Ctesias, and could have preceded it by a few months only. If we take for the date of the latter the year 514-513, the date given in the Table of the Capitol, that of the former cannot be earlier than 515. Ariaramnes was not satrap of Cappadocia, for Cappadocia belonged then to the satrapy of Daskylion. *** The supplementary paragraphs of the Inscription of Behistun speak of an expedition of Darius against the Sako, which is supposed to have had as its objective either the sea of Aral or the Tigris. Would it not be possible to suppose that the sea mentioned is the Pontus Euxinus, and to take the mutilated text of Behistun to be a description either of the campaign beyond the Danube, or rather of the preliminary _reconnaissance_ of Ariaramnes a year before the expedition itself?