Alexander then continued his onward progress, first to Marakanda (Samarcand), the chief town of Sogdiana—next, to the river Jaxartes, which he and his companions, in their imperfect geographical notions, believed to be the Tanais, the boundary between Asia, and Europe.[487] In his march, he left garrisons in various towns,[488] but experienced no resistance, though detached bodies of the natives hovered on his flanks. Some of these bodies, having cut off a few of his foragers, took refuge afterwards on a steep and rugged mountain, conceived to be unassailable. Thither however Alexander pursued them, at the head of his lightest and most active troops. Though at first repulsed, he succeeded in scaling and capturing the place. Of its defenders, thirty thousand in number, three fourths were either put to the sword, or perished in jumping down the precipices. Several of his soldiers were wounded with arrows, and he himself received a shot from one of them through his leg.[489] But here, as elsewhere, we perceive that nearly all the Orientals whom Alexander subdued were men little suited for close combat hand to hand,—fighting only with missiles. [487] Pliny, H. N. vi. 16. In the Meteorologica of Aristotle (i. 13, 15-18) we read that the rivers Bahtrus, Choaspes, and Araxes flowed from the lofty mountain Parnasus (Paropamisus?) in Asia; and that the Araxes bifurcated, one branch forming the Tanais, which fell into the Palus Mæotis. For this fact he refers to the γῆς περιόδοι current in his time. It seems plain that by the Araxes Aristotle must mean the Jaxartes. We see, therefore, that Alexander and his companions, in identifying the Jaxartes with the Tanais, only followed the geographical descriptions and ideas current in their time. Humboldt remarks several cases in which the Greek geographers were fond of supposing bifurcation of rivers (Asie Centrale, vol. ii. p. 291). [488] Arrian, iv. 1, 5. [489] Arrian, iii. 30, 17.