The words prathame yuge mean in the beginning of the first millennium, that is to say, in the beginning of the Vaivasvata manvantara. In one day of Brahma there are fourteen Manus, who each live for seventy-one millenniums. The four yugasSatya, Treta, Dvapara and Kaliconstitute one millennium. We are presently in the manvantara of Vaivasvata Manu, who is mentioned in Bhagavad-gita (imam vivasvate yogam proktavan aham avyayam/ vivasvan manave praha [Bg. 4.1]). We are now in the twenty-eighth millennium of Vaivasvata Manu, but this fight took place in the beginning of Vaivasvata Manus first millennium. One can historically calculate how long ago the battle took place. Since each millennium consists of 4,300,000 years and we are now in the twenty-eighth millennium, some 120,400,000 years have passed since the battle took place on the bank of the River Narmada.