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Philip died and Alexander became the king of Greek.
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He crossed into Asia minor and defeated the Persian king Darius in a great battle
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He defeated the Persians again on river Tigris as Darius was murdered an became the ruler of the vast Persian empire.He also added Syria,Israel,Egypt to his empire.
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Alexander entered north-west India to recapture the rest of Persian empire.He defeated the vast army of Porus which included big animals as war elephant.
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He married Roxanne and capture Persian noblewoman and took many soldiers into his largely Greek army he tried to unite all parts of his empire.