Another march brought Alexander to the borders of Libya, Here he received the submission of Cyrene, the most important Greek colony in Africa. [7] Alexander's dominions were thus extended to the border of the Carthaginian possessions. It was at this time that Alexander visited a celebrated temple of the god Amon, located in an oasis of the Libyan desert. The priests were ready enough to hail him as a son of Amon, as one before whom his Egyptian subjects might bow down and adore. But after Alexander's death his worship spread widely over the world, and even the Roman Senate gave him a place among the gods of Olympus. BATTLE OF ARBELA, 331 B.C. The time had now come to strike directly at the Persian king. Following the ancient trade routes through northern Mesopotamia, Alexander crossed the Euphrates and the Tigris and, on a broad plain not far from the ruins of ancient Nineveh, [8] found himself confronted by the Persian host. Darius held an excellent position and hoped to crush his foe by sheer weight of numbers. But nothing could stop the Macedonian onset; once more Darius fled away, and once more the Persians, deserted by their king, broke up in hopeless rout. END OF THE PERSIAN EMPIRE The battle of Arbela decided the fate of the Persian Empire. It remained only to gather the fruits of victory. The city of Babylon surrendered without a struggle. Susa, with its enormous treasure, fell into the conqueror's hands. Persepolis, the old Persian capital, was given up to fire and sword. [9] Darius himself, as he retreated eastward, was murdered by his own men. With the death of Darius the national war of Greece against Persia came to an end. CONQUEST OF IRAN The Macedonians had now overrun all the Persian provinces except distant Iran and India. These countries were peopled of by warlike tribes of a very different stamp from the effeminate Persians. Alexander might well have been content to leave them undisturbed, but the man could never rest while there were still conquests to be made. Long marches and much hard fighting were necessary to subdue the tribes about the Caspian and the inhabitants of the countries now known as Afghanistan and Turkestan. [Illustration: Map, EMPIRE OF ALEXANDER THE GREAT About 323 B.C.] CONQUEST OF INDIA Crossing the lofty barrier of the Hindu-Kush, Alexander led his weary soldiers into northwestern India, where a single battle added the Persian province of the Punjab [10] to the Macedonian possessions. Alexander then pressed forward to the conquest of the Ganges valley, but in the full tide of victory his troops refused to go any farther. They had had their fill of war and martial glory; they would conquer no more lands for their ambitious king. Alexander gave with reluctance the order for the homeward march. ALEXANDER'S RETURN TO BABYLON