If the inscriptions of the Assyrians leave us in almost total darkness about Bactria, the Medo-Persian epic poetry can give us full information about the country. When Ninus, king of Assyria, had subjugated all the nations of Asia as far as the Nile and the Tanais, he made an attempt upon Bactria, but without success. The entrance into the land was difficult, the number of warriors great, and they knew how to fight bravely. Then Ninus collected an army of two millions of soldiers, which was opposed by Oxyartes, the king of the Bactrians, with 400,000 men. When the Assyrian army came in detachments out of the passes, Oxyartes attacked and drove them back into the mountains with the loss of 100,000 men. The army of Ninus then combined, outnumbered and overcame the Bactrians, and scattered them into their cities, which Ninus took with little trouble. But Bactra, where was the palace of the kings, was large and well supplied, and had a very strong citadel in a high position, while the city extended over the plain. It resisted for a long time, till Semiramis ascended the citadel, and Ninus was enabled to take possession of the treasures of gold and silver which were in Bactra. At a later time Semiramis collected her vast army for the invasion of India in Bactria, and returned to Bactra after she had been defeated on the Indus, and had lost two-thirds of her army (II. 10). Such are the descriptions given by the epic poetry of the Medes and Persians, in the account of the rise of Assyria and subjugation of Bactria. The Bactrians are again brought forward in the narrative of the overthrow of Assyria, which was the proper theme of these poems. When Sardanapalus has already thrice defeated the Medes and Babylonians, a strong force comes to his assistance from Bactria. The leader of the Medes determines to attack this first, if it would not join in the contest for freedom against Assyria. The Bactrians joined the Medes, the power of Assyria was broken, and Nineveh destroyed (III. 253). From these poems it follows that in the first half of the sixth century B.C., in which the Medo-Persian epic attained its original form, the tradition, or at any rate the opinion, existed among the minstrels of Media that a powerful kingdom and large metropolis once existed in Bactria, the situation of which is correctly described. This kingdom possessed a strong citadel and abundant treasures, and could put in the field a large army of brave warriors. Without such a conception they could not represent the first attack of the Assyrians on Bactria as a failure, the second as successful only after considerable time and trouble had been spent, and the conquest as the last and greatest achievement of Ninus, the mightiest sovereign of Assyria, which he only performed with the aid of Semiramis.