Thence he marched one stage, five parasangs, to the Gates between Cilicia
. These Gates consisted of two walls; the one on the hither, or Cilician, side was held by Syennesis and a garrison of Cilicians, while the one on the farther, the Syrian, side was reported to be guarded by a garrison of the King's troops. And in the space between these walls flows a river named the Carsus, a plethrum in width. The entire distance from one wall to the other was three stadia; and it was not possible to effect a passage by force, for the pass was narrow, the walls reached down to the sea, and above the pass were precipitous rocks, while, besides, there were towers upon both the walls.