In the reign of Darius, however, the Susianians attempted to revolt, first under Assina or Atrina, the son of Umbadara, and later under Martiya, the son of Issainsakria, who called himself Immanes; but they gradually became completely Aryanized, and their agglutinative dialects were supplanted by the Aryan Persian from the south-east.
Now, that same principle had been operative from the very dawn of the history of Aryanized India.
It must remain uncertain whether it was that the thickly-populated character of the land scarcely admitted of complete occupation, but only of a conquest by an army of fighting men, starting from the Aryanized region - who might, however, subsequently draw women of their own kin after them - or whether, as has been suggested, a second Aryan invasion of India took place at that time through the mountainous tracts of the upper Indus and northern Kashmir, where the nature of the road would render it impracticable for the invading bands to be accompanied by women and children.
Later still the settlement of Brahmans along the west coast had already Aryanized the country in religion, and to some extent in language, before the Persian conquest of the Indus valley at the close of the 6th century B.C. The Persian dominion did not long survive; and the march of Alexander the Great down the Indus paved the way for Chandragupta and the Maurya, empire.
