After fifteen days of repose and festivity at Zeudracarta, the chief town of Hyrkania, Alexander marched eastward with his united army through Parthia into Aria—the region adjoining the modern Herat with its river now known as Herirood. Satibarzanes, the satrap of Aria, came to him near the border, to a town named Susia,[451] submitted, and was allowed to retain his satrapy; while Alexander, merely skirting the northern border of Aria, marched in a direction nearly east towards Baktria against the satrap Bessus, who was reported as having proclaimed himself King of Persia. But it was discovered, after three or four days, that Satibarzanes was in league with Bessus; upon which Alexander suspended for the present his plans against Baktria, and turned by forced marches to Artakoana, the chief city of Aria.[452] His return was so unexpectedly rapid, that the Arians were overawed, and Satibarzanes was obliged to escape. A few days enabled him to crush the disaffected Arians and to await the arrival of his rear division under Kraterus. He then marched southward into the territory of the Drangi, or Drangiana (the modern Seiestan), where he found no resistance—the satrap Barsaentes having sought safety among some of the Indians.[453] [451] Arrian, iii. 25, 3-8. Droysen and Dr. Thirlwall identify Susia with the town now called Tûs or Toos, a few miles north-west of Mesched. Professor Wilson (Ariana Antiqua, p. 177) thinks that this is too much to the west, and too far from Herat: he conceives Susia to be Zuzan, on the desert side of the mountains west of Herat. Mr. Prinsep (notes on the historical results deducible from discoveries in Afghanistan, p. 14) places it at Subzawar, south of Herat, and within the region of fertility. Tûs seems to lie in the line of Alexander’s march, more than the other two places indicated; Subzawar is too far to the south. Alexander appears to have first directed his march from Parthia to Baktria (in the line from Asterabad to Baikh through Margiana), merely touching the borders of Aria in his route. [452] Artakoana, as well as the subsequent city of Alexandria in Ariis, are both supposed by Wilson to coincide with the locality of Herat (Wilson, Ariana Antiqua, p. 152-177). There are two routes from Herat to Asterabad, at the south-east corner of the Caspian; one by Schahrood which is 533 English miles; the other by Mesched, which is 688 English miles (Wilson, p. 149). [453] Arrian, iii. 25; Curtius, vi. 24, 36. The territory of the Drangi, or Zarangi, southward from Aria, coincides generally with the modern Seistan, adjoining the lake now called Zareh, which receives the waters of the river Hilmend.