On the return of spring he moved forward to Ankyra (now Angora), and there had the satisfaction to receive the submission of the Paphlagonians, who at that time were a very powerful nation. Being thus free to move southwards without leaving an enemy in his rear, he entered Kappadokia, and having overrun it without encountering any serious opposition, he recrossed the Tauros by a pass that admitted him into the fertile plains of Eastern Kilikia. The capital of this province was Tarsos, a flourishing seat of commerce, art, and learning, built on both banks of the river Kydnos, which was navigable to the sea. This important city fell without resistance into Alexander’s hands, the satrap having fled at the tidings of his approach. Here, however, he nearly lost his life, having caught a violent fever by throwing himself when heated into the waters of the Kydnos, which ran cold with the snows of Mount Tauros. After his recovery he sent Parmeniôn eastward to occupy the passes leading into Syria, called the Syrian Gates, and marched himself in the opposite direction to reduce the hill-tribes of Western Kilikia. In the meantime Darius, advancing from the East, had crossed the Euphrates and the Syrian desert at the head of an army not less numerous than that with which Napoleon invaded Russia, and was lying encamped on a wide plain suitable for his cavalry within a two days’ march of the Syrian Gates. Here he waited for some time ready to fall upon the Macedonian troops and crush them with the overwhelming superiority of his numbers when they debouched from the defile. When he despaired of their coming, he marched into Kilikia through a pass known as the Amanian Gates and encamped on the banks of the Pinaros which flows through the plain of Issos to the sea. He thus placed himself in a trap where he was hemmed in by the mountains and the sea in a narrow plain not more than a mile and a half in width. Alexander meanwhile had passed through the other gates into the Syrian plain when he learned to his astonishment that Darius was now in his rear. He at once retraced his steps, and by midnight regained the pass, where from one of its summits he beheld the Persian watchfires gleaming far and wide over the plain of Issos. At daybreak he marched down the pass, and on reaching the open part of the plain made the usual disposition of his forces, Parmeniôn commanding the left, and himself the right wing. Darius had drawn up his line, which extended from the mountains to the sea, along the northern bank of the river Pinaros. In the centre, which confronted the dreaded Macedonian phalanx, he had posted a body of 30,000 heavy-armed Greek mercenaries.