Kalinga War
According to Megasthenes, the Greek historian at the court of Chandragupta Maurya, the ruler of Kalinga had a powerful army comprising infantry, cavalry and elephants. After the year, 150,000 men and women were deported from Kalinga and forced to work in clearing the wasteland for future settlements, and they were forbidden from ever returning to their old homeland. The descendants of the Kalinga people migrated later to Sindh. From there, they migrated to Persia, Mesopotamia, Egypt and Europe. Their descendants might be the Roma of Europe.