The Tale of Kamadhenu's Army
When the sage Vasistha was attacked by king Viswamitra's army, Vasistha's cow, Kamadehnu, brought forth from her tail, an army of Palhavas, and from her udders, an army of Dravidas and Sakas; and from her womb, an army of Yavanas, and from her dung, an army of Savaras; and from her urine, an army of Kanchis; and from her sides, an army of Savaras. And from the froth of her mouth came out hosts of Paundras and Kiratas, Yavanas and Sinhalas, and the barbarous tribes of Khasas and Chivukas and Pulindas and Chinas and Hunas with Keralas, and numerous other Mlechchhas.
In the ancient Indian literature, cow is a symbol of earth or land. Thus the myth mentioned above simply means that, these tribes gathered for the protection of sage Vasistha's land against the army of king Viswamitra. This myth indicates that the ancient people could not understand the real origins of these Mlechcha tribes who were highly skilled in weapons, warfare and material sciences but never followed the Vedic rites properly.
The confusion of ancient Vedic people in dealing with the unfamiliar tribes is evidient in the following passage from Mahabharata. At (12:35) is mentioned:- What duties should be performed by the Yavanas, the Kiratas, the Gandharvas, the Chinas, the Savaras, the Barbaras, the Sakas, the Tusharas, the Kankas, the Pathavas, the Andhras, the Madrakas, the Paundras, the Pulindas, the Ramathas, the Kamvojas, the several castes that have sprung up from Brahmanas and Kshatriyas, the Vaisyas, and the Sudras, that reside in the dominions of (Arya) kings?.
They were later given the status of Sudras. It is in consequence of the absence of Brahmanas from among them that the Sakas, the Yavanas, the Kamvojas and other Kshatriya tribes have become fallen and degraded into the status of Sudras. The Dravidas, the Kalingas, the Pulandas, the Usinaras, the Kolisarpas, the Mahishakas and other Kshatriyas, have, in consequence of the absence of Brahmanas from among their midst, become degraded into Sudras (13:33).