There is no more stirring story in all history than this progress of the Macedonian force. Step by step it has been traced out from Granikos to Issos and from Issos to Arbela; but this is not the place to recapitulate that part of the story which applies only to Western Asia. It is not until after the final decisive battle at Arbela, when Darius fled in hot haste along the south-eastern road to Ecbatana, the former capital of Media, and thence in the spring of 330 B.C. retreated with a disorganized force and an intriguing court towards Baktria, where he hoped to find a refuge with his kinsman Bessos the satrap of that province, that we really touch on the subject with which we wish to deal in this book, viz. the high-roads to Afghanistan in those long past days. Alexander, meanwhile, had received the submission of Babylon and restored the temple of Belus, and made himself master of a more spacious empire than the world had yet seen. It was then that the amazing results of his military success began to turn his head. From this point the severe simplicity of the Macedonian soldier is exchanged for the luxury, arrogance, and intolerance of the despot and conqueror. As Alexander advanced in material strength so did he slide down the easy descent of moral retrogression, and whilst we can still admire his magnificence as a military leader we find little else left to admire about him. From Babylon to the lovely valley wherein lies Susa, and from Susa to Persepolis, was more or less of a triumphal march in spite of the fierce opposition of the satrap Artobaizanes. Of Persepolis we are taught to believe that Alexander left nothing behind him but blackened ruins--the result of a drunken orgy. During the winter, amidst snow and ice, he subdued the Mardians in their mountain fastnesses (for he never left an active foe on the flank or rear), and with the return of the sweet Persian spring he renewed his hunt after Darius, turning his face to the north and east.