Introduction to the Mongolian Expedition: When I see the grassland, I think of the Mongolian Expedition. He connected the Eurasian continent with post roads and became one. This is a map of Niuhide’s Mongolian expedition. Expeditions smoothed the spread of trade culture. This nomadic people on horseback, with only 40,000 Mongolians, ruled a vast area stretching from Irtysh in the east to Poland and Hungary in the west.