HEAD OF GURU VASHISHTHA .... The evidence is the Head of Vasista discovered in Delhi.A copper item representing a human head styled in the manner described for the Rigvedic Vashista has been dated to around 3700 B.C. in three western universities using among other tests carbon 14 tests, spectrographic analysis, X-ray dispersal analysis and metallography. . The head was not found in an archaeological context, as it was rescued from being melted down in Delhi.
Vasista was the adviser to king Sudas , the Bharatha King who won the war .
In Book 7 of the RV we find reference to the Dasarajna war (Battle of the ten kings) between various ancient tribes including the Bharatas (Indians) Parsu(Persians), Druhyu (Druids) etc.It was fought on the banks of the Parusni river in NW India. Today the river is called Ravi.
It is the oldest recorded war in history. Not just that, it was no mere neolithic stick and stone fight .It was the first organized war-- with infantry,archers and elephants .Its date may safely be placed at around 7200 BC..