How long he had consciously destined his fighting machine to an ultimate invasion of Asia we do not know. The Athenians had explicitly stated to the Great King in 341 that such was the Macedonian's ambition, and four years earlier public suggestion of it had been made by the famous orator, Isocrates, in an open letter written to Philip himself. Since the last named was a man of long sight and sustained purpose, it is not impossible that he had conceived such an ambition in youth and had been cherishing it all along. While Philip was in Thebes as a young man, old Agesilaus, who first of Greeks had conceived the idea of invading the inland East, was still seeking a way to realize his oft-frustrated project; and in the end he went off to Egypt to make a last effort after Philip was already on the throne. The idea had certainly been long in the air that any military power which might dominate Hellas would be bound primarily by self-interest and secondarily by racial duty to turn its arms against Asia. The Great King himself knew this as well as any one. After the Athenian warning in 341, his satraps in the north-west of Asia Minor were bidden assist Philip's enemies in every possible way; and it was thanks in no small measure to their help, that the Byzantines repulsed the Macedonians from their walls in 339. Philip had already made friends of the princely house of Caria, and was now at pains to secure a footing in north-west Asia Minor. He threw, therefore, an advance column across the Dardanelles under his chief lieutenant, Parmenio, and proposed to follow it in the autumn of the year 336 with a Grand Army which he had been recruiting, training and equipping for a twelvemonth. The day of festival which should inaugurate his great venture arrived; but the venture was not to be his. As he issued from his tent to attend the games he fell by the hand of a private enemy; and his young son, Alexander, had at first enough to do to re-establish a throne which proved to have more foes than friends. SECTION 5. ALEXANDER'S CONQUEST OF THE EAST A year and a half later Alexander's friends and foes knew that a greater soldier and empire-maker than Philip ruled in his stead, and that the father's plan of Asiatic conquest would suffer nothing at the hands of the son. The neighbours of Macedonia as far as the Danube and all the states of the Greek peninsula had been cowed to submission again in one swift and decisive campaign. The States-General of Greece, re-convoked at Corinth, confirmed Philip's son in the Captain-Generalship of Hellas, and Parmenio, once more despatched to Asia, secured the farther shore of the Hellespont. With about forty thousand seasoned horse and foot, and with auxiliary services unusually efficient for the age, Alexander crossed to Persian soil in the spring of 334.