The Development of the Route
The development of these Central Asian trade routes caused some problems for the Han rulers in China. Bandits soon learnt of the precious goods travelling up the Gansu Corridor and skirting the Taklimakan, and took advantage of the terrain to plunder these caravans. Caravans of goods needed their own defence forces, and this was an added cost for the merchants making the trip. The route took the caravans to the farthest extent of the Han Empire, and policing this route became a big problem. This was partially overcome by building forts and defensive walls along part of the route. Sections of `Great Wall' were built along the northern side of the Gansu Corridor, to try to prevent the Xiongnu from harming the trade; Tibetan bandits from the Qilian mountains to the south were also a problem. Sections of Han dynasty wall can still be seen as far as Yumen Guan, well beyond the recognised beginning of the Great Wall at Jiayuguan. However, these fortifications were not all as effective as intended, as the Chinese lost control of sections of the route at regular intervals.
The Han dynasty set up the local government at Wulei, not far from Kuqa on the northern border of the Taklimakan, in order to `protect' the states in this area, which numbered about 50 at the time. At about the same period the city of Gaochang was constructed in the Turfan basin. This developed into the centre of the Huihe kingdom; these peoples later became the Uygur minority who now make up a large proportion of the local population. Many settlements were set up along the way, mostly in the oasis areas, and profited from the passing trade. They also absorbed a lot of the local culture, and the cultures that passed them by along the route. Very few merchants traversed the full length of the road; most simply covered part of the journey, selling their wares a little further from home, and then returning with the proceeds. Goods therefore tended to moved slowly across Asia, changing hands many times. Local people no doubt acted as guides for the caravans over the most dangerous sections of the journey.
After the Western Han dynasty, successive dynasties brought more states under Chinese control. Settlements came and went, as they changed hands or lost importance due to a change in the routes. The chinese garrison town of Loulan, for example, on the edge of the Lop Nor lake, was important in the third century A.D., but was abandoned when the Chinese lost control of the route for a period. Many settlements were buried during times of abandonment by the sands of the Taklimakan, and could not be repopulated.