First ordered to be built by Emperor Wu (156 B.C. – 87 B.C.) of the Han Dynasty at the Hexi Corridor after he asserted his control of the region routinely harassed by the marauding Huns to the north of China, the Han Great Wall served the purpose of cutting off the link between the Huns and the Qiang people, another hostile tribe, as well as protecting the fledgling Silk Road that dated to the same empire.
In contrast to parts of the Great Wall built with stone, such as the one in Badaling, Beijing, the Han Great Wall was constructed mostly using sand, dirt, and plants like reeds, which were abundant in the area.