to conquer the other surrounding towns. Five of the seven towns were taken in two days. Many of the inhabitants were killed. Alexander then arrived at Cyropolis, which was the best fortified of the towns and had the largest population. It also had reputedly the best fighters of the region. Alexander battered Cyropolis' defenses with the siege engines. While the bombardment went on, Alexander ordered certain of his troops to sneak through a dried-up water course that went under the town's wall. Alexander also joined on this mission and once inside his troops opened the town's gate to admit his attacking force. Once the natives saw that the town was taken, they fell violently upon the attackers. Alexander received a violent blow from a stone that landed upon his head and neck. Craterus was wounded by an arrow. But the defenders were driven off. Arrian puts the defender's force at about 15,000 fighting men and claims that 8,000 of them were killed in the first phase of the operation. The rest apparently sought refuge inside the town's central fortress, but surrendered after one day for lack of water. Accounts of how the battle went down differ among authors. Arrian cites Ptolemy as saying Cyropolis surrendered from the start, and Arrian also states that according to Aristobulus the place was stormed and everyone was massacred. One, probably Cyropolis, came to be called Alexandria Eschate, his northeastern-most outpost. As with most other cities founded by Alexander, a group of retired and/or wounded veterans from his army was settled there, joining the large population of Greek exiles settled in the area by Persia in previous generations. Hellenistic period Because Alexandria Eschate was surrounded by Sogdian tribes, and was about north of the nearest Greek settlement, at Alexandria on the Oxus in Bactria, the Greeks built a wall around the city which, according to the ancient authors, was completed in about 20 days. It experienced numerous conflicts with the local population. From 250 BC, the city likely had greater contact with Bactria, after the Greco-Bactrian king Euthydemus I extended his control into Sogdiana. Alexandria Eschate was also located around west of the Tarim Basin (now Xinjiang, China), where other Indo-European peoples, like the Khotanese, Tocharians, Wusun and/or Yuezhi were established. There are indications that Greek expeditions travelled as far as Kashgar. The historian Strabo claims that the Greeks "extended their empire even as far