Arrived at the modern boundary between Persia, Afghanistan, and Russia, he and his men pushed on across Afghanistan, by the caravan route that had long existed from the shores of the Caspian, by modern Herat, Kandahar,[1] which still bears the conqueror's name, and Kabul to India. Their way lay through deep snow, deeper than they had ever seen before; and by the time they had reached the mountains of Kabul it was midwinter. [Footnote 1: Kandahar = Alexandria in a modern form.] Between Alexander and India still lay the lofty range of the Hindu Koosh or Indian Caucasus. But before going south toward India, he turned northwards to explore the unknown country which lay about the river Oxus. They found the Oxus, a mighty stream, swollen with melting snows. There were no boats and no wood to build them, so Alexander pioneered his men across in "life-preservers" made out of their leather tent coverings and stuffed with straw. This river impressed the Greeks even more than the Euphrates and Tigris, as it impressed many an explorer and poet since these early days. Let us recall Matthew Arnold's famous description of the Oxus, now seen for the first time by the Greeks. "But the majestic river floated on, Out of the mist and hum of that low land, Into the frosty starlight, and there moved * * * * * Brimming, and bright, and large; then sands begin To hem his watery march and dam his streams, And split his currents; that for many a league The shorn and parcell'd Oxus strains along Through beds of sand and matted rushy isles-- Oxus, forgetting the bright speed he had, In his high mountain-cradle in Pamere, A foil'd circuitous wanderer--till at last The long'd for dash of waves is heard, and wide His luminous home of waters opens, bright And tranquil, from whose floor the new-bathed stars Emerge, and shine upon the Aral Sea." Here in this valley the Greeks met more determined opposition than they had yet encountered since entering Asia, and over two years were occupied in reducing this single district (now Bokhara and Turkestan) to submission, though it was only some three hundred and fifty miles square, and in one single year Alexander had conquered a kingdom over one thousand miles in width. It was not till the spring of 327 B.C. that he was ready to cross the Hindu Koosh and begin the great expedition into India. The night before the start Alexander discovered that his troops were now so heavily laden with spoils that they were quite unfit for the long march. So in the early morning, when they were all ready to start, he suddenly set fire to his own baggage, and, giving orders that all his men were to do the same, the army started for the passes of the lofty mountain range. And--