Seleucid-Mauryan war
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Was a ware waged by the Seleucid Kingdom to conquer back former Macedonian Satrapies in the Indus Valley from the Mauryan Empire.
Chronology
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January 302 BC: Later Eudemus took over Taxila briefly, however he was killed by Malayketu after which Chandragupta Maurya conquered Alexander's satraps in the sub-continent by BC, and joined hands with Porus earlier, in around 322 BC. Some state that after Alexander's departure from India, Takshashila became a free kingdom, and that's when Porus conquered Takshashila and there, he may have killed Taxiles. However, it still remains unsure what happened to Taxiles, and whether he was deposed or assassinated.
January 302 BC: Expansion of the Magadha Kingdom until 301 BC.
January 300 BC: After the death of Alexander the Great in 323 BC, Chandragupta led a series of campaigns in 305 BC to retake satrapies in the Indus Valley and northwest India. When Alexander's remaining forces were routed, returning westwards, Seleucus I Nicator fought to defend these territories. Not many details of the campaigns are known from ancient sources. Seleucus was defeated and retreated into the mountainous region of Afghanistan.
The two rulers concluded a peace treaty in 303 BC, including a marital alliance. Under its terms, Chandragupta received the satrapies of Paropamisadae (Kamboja and Gandhara) and Arachosia (Kandhahar) and Gedrosia (Balochistan). Seleucus I received the 500 war elephants that were to have a decisive role in his victory against western Hellenistic kings at the Battle of Ipsus in 301 BC.
January 302 BC: The emerging and expanding Mauryan Empire came into conflict with Seleucus over the Indus Valley. Seleucus invaded the Punjab region of India, confronting Chandragupta Maurya. Maurya finally gained all the macedonian satrapies in the Indus valley.
January 302 BC: It seems probable that Oxyartes must have died before the Seleucus's diplomatic/military foray into South Asia, as Seleucus ceded Paropamisadae to Chandragupta Maurya without any mention of Oxyartes.
Selected Sources
Schwartzberg,J. E. (1992): A Historical Atlas of South Asia, Minneapolis (USA), Plate III.B.4b (p.18) and Plate XIV.1a-c (p.145).
