...overed depths is plunged And holds a secret course; then born again Flows on unhindered to the Persian sea. But warlike Parthia wavered 'twixt the chiefs, Content to have made them two ; while Scythia 's hordes Dipped fresh their darts in poison, whom the stream Of Bactros bounds and vast Hyrcanian woods. Hence springs that rugged nation swift and fierce, Descended from the Twins' great chariot...