The Dasharajnya War or “war of 10 kings” was a turning point in the history of India because it firmly re-established the dominance of the Puru-Bharata Dynasty over smaller royal dynasties and tribal chieftans over the Sapta-Sindhu region going west towards present-day Afghanistan/Persia and east towards Uttar Pradesh. This Puru-Bharata Dynasty provided the continuity of leadership which is documented in the ancient scriptures of Sanathana Dharma (Hinduism) — particularly the Rigveda. The fact that this great story, which I believe must be raised to the standard of ‘epic’ in all fairness, is relatively unknown and forgotten is surprising and raises questions. When did this war occur? Where did this all happen? Why is it important and why should it be raised to the level of India’s two existing epics, namely the Ramayana and the Mahabharata?[Hindu Council UK (email from Rajeev Srinivasan)]
Niraj Mohanka has a long article on the Battle of the Ten Kings and dates it to 2900 BCE. One line in the article — the gifts given by Sudas to his priest Vasishta (2 chariots, 4 horses with gold trappings) — will make you wonder if there were horses at that time? Didn’t Aryans bring horses to India.? To find answers it is worth reading The Horse and the Aryan Debate by Michel Danino along with this.