Babylonian War
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Was a conflict fought in 311-309 BC between Antigonus I Monophthalmus and Seleucus I Nicator, ending in a victory for Seleucus.
Chronology
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June 311 BC: The Babylonian War was a conflict fought between the Diadochi kings Antigonus I Monophthalmus and Seleucus I Nicator. Seleucus, reinforced with Macedonian veterans from Harran, reached his former capital Babylon. He was soon recognized as the new ruler.
June 310 BC: News of the defeat of Nicanor and Euagoras must have reached Antigonus at about the time of his signing the Peace of the Dynasts (December 311 BC). He ordered his son Demetrius Poliorcetes to restore order; he arrived in the early spring of 310 BC.
June 310 BC: Seleucus drives Demetrios out of Babylon.
September 310 BC: The forces of general Antigonus leave Babylon.
November 310 BC: Without any problems, Seleucus could move through the Zagros Mountains, occupy Ecbatana (the capital of Media), and continue to Susa (the capital of Elam). He now controlled southern Iraq and the greater part of Iran.
April 309 BC: Antigonos is repulsed from Babylon.
January 308 BC: The victor now moved to the east and reached the Indus valley, where he concluded a treaty with Chandragupta Maurya. The Mauryan emperor received the eastern parts of the Seleucid Empire, which included Afghanistan, Pakistan and west India, and gave Seleucus a formidable force of five hundred war elephants.
December 311 BC: Antigonus' satraps in Media and Aria, Nicanor and Euagoras, now decided to intervene with an army of 10,000 infantry and 7,000 horsemen, but Seleucus and an army of 3,000 infantry and 400 cavalry had been waiting for them near the Tigris since September. By hiding his men in one of the marshes and attacking by night, Seleucus was able to defeat the Macedonian soldiers in the army of Nicanor and Euagoras, after which the Iranian soldiers decided to side with the ruler of Babylonia.