Mahabharata also notifies that the Daradas, Sakas, Kambojas, Yavanas etc. were originally Kshatriyas but were slowly sank to the status of vrishalah or degraded Kshatriyas due to the wrath of the Brahmanas.
From the Vishnu Purana and other Puranas, one understands that although basically of Kshatriya origin, a branch of Gargas became Brahmins and migrated westwards and joined the Yavanas (Ionians).
According to numerous Puranas, the military corporations of the Shakas, Yavanas, Kambojas, Pahlavas and Paradas, known as "five hordes" (pānca-ganah), had militarily supported the Haihaya and Talajunga Kshatriyas in depriving Ikshvaku king Bahu (the 7th king in descent from Harishchandra), of his Ayodhya kingdom.