With the assistance of the Avesta we may go a step further. We saw that Kava Huçrava no less than Vistaçpa is represented as fighting against the Turas or Tuiryas. Who were these enemies? In Old-Bactrian the word means the enemy, the oppressor. Strabo speaks of a region of Turuia in the north of Parthia, towards the steppes of the Oxus.[75] In the later tradition of Iran the Turanians are the constant and most dangerous enemies of the kings of Bactria. The steppes of the Oxus and Jaxartes were inhabited by nations to whom the Persians gave the collective name of Sacæ, while the Greeks called them Scythians. They found but scanty pasture on the steppes, and it was natural that they should look with longing eyes on the more fertile regions of Bactria and Sogdiana. It has already been mentioned how careful Cyrus was to protect these countries, when he had conquered them, against the nations of the steppes. At a later time, from the middle of the second century B.C. downwards (p. 28), we have definite information of the pressure of these nations on Parthia, Margiana, and Bactria. When freed from the attacks of the Seleucids on the west, the Arsacids had to defend the east of the kingdom. Phraates II. and Artabanus II. fell in battle against the nomads; Mithridates II. succeeded in protecting Parthia, but about the year 100 B.C. the Sacæ were able to force a way through Bactria. They possessed themselves of the best land in the east of Iran, the valleys of the Hilmend (p. 7), bequeathed their name to the country (Sikashtan, Sejestan), and from the valley of the Cabul extended their dominion beyond the Indus. The white Huns, or Yuëchis, followed the Sacæ; and they also reached the Indus. Is there any reason to doubt the Avesta that even before the Medes and Cyrus the princes of Bactria and Sogdiana were occupied with beating back the tribes of the steppes? In ancient times, as Strabo tells us, the Bactrians and Sogdiani were little removed from wandering shepherds. The Avesta exhibits them in close connection with horses. The names compounded with _açpa_ (horse) are common; Kereçaçpa, Aurvataçpa, Vistaçpa, Haechataçpa, Jamaçpa, Pourushaçpa. Of Zariaçpa and the Zariaçpians we have already spoken. The most important source of wealth must have consisted in horses, for which the mountains supplied ample pasture. The horse-sacrifice is the chief sacrifice of the Avesta. One hundred horses were equal to 1000 oxen, and 10,000 head of small cattle. We found that Bactria could furnish the last Darius with 30,000 cavalry, and the horse was the symbol of Bactria on the coins of the Greek princes of the land (p. 27).