Aornos was the site of Alexander the Great's last siege, "the climax to Alexander's career as the greatest besieger in history" according to Alexander's biographer Robin Lane Fox. The siege took place in the winter of 327–326 BCE. It offered the last threat to Alexander's supply line, which stretched, dangerously vulnerable, over the Hindu Kush back to Balkh, though Arrian credits Alexander's heroic desire to outdo his kinsman Heracles, who allegedly had proved unable to take the place Pir-Sar, which the Greeks called Aornis. The site lies north of Attock in Punjab, on a strongly reinforced mountain spur above the narrow gorges in a bend of the upper Indus River. It had a flat summit well supplied with natural springs and wide enough to grow crops: it could not be starved to submission. Ne