The Aryans appear in Mitanni from 1500 BC as the ruling dynasty, which means that they must have entered the country as conquerors.

Burrow, T. 1955 (Reprint). The Sanskrit Language. Faber and Faber. quoted in The Homeland of Indo-European Languages and Culture: Some Thoughts by Prof. B. B. Lal, Paper presented at a seminar organized by the Indian Council for Historical Research on the same theme in Delhi on 7-9 January 2002