Darius fled northwards from Ecbatana upon his approach.
Death by Alexander in 327, whose history went up to the death of Darius, Alexander's general Ptolemy, afterwards king in Egypt, Nearchus who commanded the fleet that sailed from the Indus to the Persian Gulf, Onesicritus who served as pilot in the same fleet, Aristobulus who was with Alexander in India, Clitarchus, a contemporary, if not an eye-witness, important from the fact that his highly coloured version of the life of Alexander became the popular authority for the succeeding centuries.
We have no means of explaining this statement, nor can we fully understand all the incidents connected with his usurpation; but the attempts of modern authors to prove that Gaumata in reality was the genuine Smerdis and Darius a usurper have failed.
His passage through Cilicia was marked by a violent fever that arrested him for a while in Tarsus, and meantime a great Persian army was waiting for him in northern Syria under the command of Darius himself.
To cut Alexander's communications with the rear, Darius now committed the error of entangling his large force in the mountain defiles.