Their neighbors called the Onggud by different names, but each name revealed a certain aspect of their identity, location, or relation with stronger powers around them. Although large and scarcely populated, the area has a consistent ecological appearance that is succinctly summarized in the Chinese name for the Onggud. They call them the Shatuo, meaning “the Sandy Gravel tribe,” in reference to this transitional zone between the desert and farmland. The Chinese also referred to the Onggud as the White Tatars, a benign designation that distinguished them from the wilder Mongols, whom they called Black Tatars.
The Mongols consistently called them the Onggud, and according to the etymology recorded by a thirteenth-century Persian chronicler, they acquired their name from a word for wall. They were therefore the People of the Wall, representing their occupational status and geographic location under the Jin Dynasty of the Jurched. Whether the etymology was true or not, this designation “People of the Wall” accurately encapsulates their history: They traditionally manned the forts and protected the Chinese settlements from the other, wilder tribes of the steppes. Another etymology derives from the word for gate or opening, and this designation also shows that for the Mongols, they were not so much a barrier to China as the entrance into it.
Because of their loyalty to a series of northern Chinese dynasties, the Onggud also had an official designation as a military prefecture called the Tiande Jun, a type of border patrol. Although willing to guard the frontier and work for their Chinese or other employer, the Onggud carefully maintained their own Turkic language, and they repeatedly embraced foreign religions, such as Christianity; that set them firmly apart from the Chinese population and from the ruling dynasty of both the Song and the Jin.
Marco Polo wrote that these people called themselves Ung, which is the singular form of the name Onggud. He, however, preferred to call them by their more official designation as the Tenduc, his rendering in Latin letters of the title of Tiande Jun, referring to the militarized border zone where they lived. After the travels of Marco Polo, the Onggud became known in the West as the Tenduc. As Dutch map-makers began to chart the most distant parts of the Asian interior, they consistently used this name, giving the tribe a prominent position located in various places from the Pacific Coast to the Arctic Sea.
Through contacts with the civilizations of China and the Silk Route, the Onggud developed an early tradition of literacy long before the Mongols and most of the other steppe tribes. Depending upon the political climate and the changing weather patterns, they sometimes farmed and other times herded. They lived in settled communities and occasionally built cities, but then returned to nomadic life when necessary or advantageous. The combination of agricultural and herding lifestyles provided the materials for their most desired trade goods. They manufactured and marketed camlet, a luxuriously soft fabric made from a combination of fine camel hair from the steppe and silk from China in the south.
Onggud leaders exercised a special skill for detecting and befriending the next rising power on the steppe. The success of their leaders derived from their demonstrated ability to make themselves useful enough that each new dynasty needed their immediate assistance against the steppe tribes. At no time did the Onggud skill in picking the future power become more obvious, or more advantageous to them, than when they allied with the rising conqueror Genghis Khan and his Mongols. Yet the decision lacked unanimity, and Onggud opinion divided sharply between those who favored the new alliance and those who wanted to preserve their older relationship with the richer and far better established Jin Dynasty of the Jurched.
The movement of Alaqai Beki off the Mongolian Plateau began Genghis Khan’s expansion into the vast civilizations and kingdoms south of the Gobi. Cities and kingdoms stretched out in a seemingly infinite array before the Mongols: the Jurched kingdom with its millions of Chinese peasants and craftsmen; the small but productive kingdoms of Korea; the exotic and mystic land of Tibet; the degenerate but luxurious miniature Song Empire of South China, the isolated and varied kingdoms of Yunnan, and still more whose names and people remained completely unknown to the Mongols.
Before the Mongols could taste the wealth of any of these distant lands, they needed a beachhead to the south of the Gobi. The Gobi loomed like a large ocean of rock and gravel protecting the southern kingdoms from the northern tribes. Under good conditions, crossing the Gobi required six weeks, but they had to be very carefully chosen weeks. A small error could easily lead to the death of hundreds of warriors and horses.