The Cambridge History of India, Vol. I: Ancient India v1.c27.27

v1.c27.27

A precise date for the overthrow of Nanda seems with our present evidence impossible. It can hardly have been effected without the co-operation of the kingdom of Porus. We have then two alternatives. Either Porus participated in the invasion and is the Parvataka, the ally of Chandragupta, in the drama², in which case the year 321 B.C. would be not unlikely, as the death of Porus seems to have followed that of Alexander by no long interval. Or his successor, whether a member of his family or Chandragupta himself, was a participator: and then we have no means of dating, unless we allow the indications of the drama to persuade us that Eudamus, the assassinator of Porus, who in 323 succeeded Philippus as Alexander's representative and who retired from India in about 317, was also a partner in the exploit³. As regards the incidents of the campaign, we have no trustworthy information. Nanda was defeated and killed, and his capital occupied.