Seleucid–Mauryan relations

Expecting a confrontation, Seleucus gathered his army and marched to the Indus. It is said that Chandragupta could have fielded a conscript army of 600,000 men and 9,000 war elephants. But instead, a treaty occurred in which Chandragupta received, the vast territory west of the Indus, including the Hindu Kush, modern-day Afghanistan, and the Balochistan province of Pakistan. It is generally thought that Chandragupta married Seleucus's daughter, or a Macedonian princess, a gift from Seleucus to formalize an alliance. In a return gesture, Chandragupta sent 500 war elephants, a military asset that would play a decisive role at the Battle of Ipsus in 301 BC.