But for a time the line of least resistance for hungry nomads lay neither to the west nor the east but through central Asia and then south-eastward through the Khyber Pass into India. It was India which received the Mongolian drive in these centuries of Roman and Chinese strength. A series of raiding conquerors poured down through the Punjab into the great plains to loot and destroy. The empire of Asoka was broken up, and for a time the history of India passes into darkness. A certain Kushan dynasty founded by the “Indo- Scythians”—one of the raiding peoples—ruled for a time over North India and maintained a certain order. These invasions went on for several centuries. For a large part of the