The expedition had killed all the young men of Athens. The city was doomed. After a long siege the town surrendered in April of the year 404. The high walls were demolished. The navy was taken away by the Spartans. Athens ceased to exist as the center of the great colonial empire which it had conquered during the days of its prosperity. But that wonderful desire to learn and to know and to investigate which had distinguished her free citizens during the days of greatness and prosperity did not perish with the walls and the ships. It continued to live. It became even more brilliant. Athens no longer shaped the destinies of the land of Greece. But now, as the home of the first great university the city began to influence the minds of intelligent people far beyond the narrow frontiers of Hellas. ALEXANDER THE GREAT ALEXANDER THE MACEDONIAN ESTABLISHES A GREEK WORLD-EMPIRE, AND WHAT BECAME OF THIS HIGH AMBITION WHEN the Achaeans had left their homes along the banks of the Danube to look for pastures new, they had spent some time among the mountains of Macedonia. Ever since, the Greeks had maintained certain more or less formal relations with the people of this northern country. The Macedonians from their side had kept themselves well informed about conditions in Greece. Now it happened, just when Sparta and Athens had finished their disastrous war for the leadership of Hellas, that Macedonia was ruled by an extraordinarily clever man by the name of Philip. He admired the Greek spirit in letters and art but he despised the Greek lack of self-control in political affairs. It irritated him to see a perfectly good people waste its men and money upon fruitless quarrels. So he settled the difficulty by making himself the master of all Greece and then he asked his new subjects to join him on a voyage which he meant to pay to Persia in return for the visit which Xerxes had paid the Greeks one hundred and fifty years before. Unfortunately Philip was murdered before he could start upon this well-prepared expedition. The task of avenging the destruction of Athens was left to Philip's son Alexander, the beloved pupil of Aristotle, wisest of all Greek teachers. Alexander bade farewell to Europe in the spring of the year 334 B.C. Seven years later he reached India. In the meantime he had destroyed Phoenicia, the old rival of the Greek merchants. He had conquered Egypt and had been worshipped by the people of the Nile valley as the son and heir of the Pharaohs. He had defeated the last Persian king--he had overthrown the Persian empire he had given orders to rebuild Babylon--he had led his troops into the heart of the Himalayan mountains and had made the entire world a Macedonian province and dependency. Then he stopped and announced even more ambitious plans.