ing on, he crossed the Euphrates and the Tigris without opposition; but upon the plain of Arbela, not far from ancient Nineveh, he found his further advance disputed by Darius with an immense army. Again the Macedonian phalanx "cut through the ranks of the Persians as a boat cuts through the waves." The fate of Darius has been already narrated in our story of the last of the Persian kings (see p. 82).
The battle of Arbela was one of the decisive combats of history. It marked the end of the long struggle between the East and the West, between Persia and Greece, and prepared the way for the spread of Hellenic civilization over all Western Asia.
Alexander at Babylon, Susa, and Persepolis.—From the field of Arbela Alexander marched south to Babylon, which opened its gates to him without opposition. Susa was next entered by the conqueror. Here he seized incredible quantities of gold and silver ($57,000,000, it is said), the treasure of the Great King.
From Susa Alexander's march was next directed to Persepolis, where he secured a treasure more than twice as great ($138,000,000) as that found at Susa. Upon Persepolis Alexander wreaked vengeance, for all Greece had suffered at the hands of the Persians. Many of the inhabitants were massacred, and others sold into slavery; while the palaces of the Persian kings were given to the flames.
Alexander, having thus overthrown the power of Darius, now began to regard himself, not only as his conqueror, but as his successor, and was thus looked upon by the Persians. He assumed the pomp and state of an Oriental monarch, and required the most obsequious homage from all who approached him. His Greek and Macedonian companions, unused to paying such servile adulation to their king, were much displeased at Alexander's conduct, and from this time on to his death, intrigues and conspiracies were being constantly formed among them against his power and life.
Conquest of Bactria.—Urged on by an uncontrollable desire to possess himself of the most remote countries of which any
