Niemand
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over 650 million people
An akshauhini is a military formation consisting of 21,870 chariots, 21,870 war elephants, 65,610 cavalry, and 109,350 infantry.
That is, 1 akshauhini consists of approximately 250,000 soldiers. Multiplying this number by 18, we get 4.5 million. If both sides had mobilized all their combat-ready population, the total number of inhabitants in the territories under their control could be estimated at 22-23 million. But, since only Kshatriyas and (in small numbers) Brahmins fought, this figure increases by a factor of 20. 400 million. 5,000 years ago? Isn't that too much? And if there were 650 million of them, then the total population of India alone was something like 65 billion people. In my opinion, that's an exaggeration.