The Cambridge History of India, Vol. I: Ancient India v1.c31.4

v1.c31.4

The alternative suggestion that the Çakas may have come into India from their northern home in the country of the Jaxartes through Kashmīr involves a physical impossibility. The geographical difficulties of this region are such that an invasion from this direction of tribal hordes or armies sufficiently powerful to overwhelm the Yavana kingdoms and to conquer the whole of the N.W. Frontier Province and the Punjab is inconceivable¹.