Nineteen stone inscriptions survive commemorating the building of new roads and bridges by the Eastern Han government. Archaeological excavations at Chang'an show that wooden bridges were built over the defensive moat and led to the gatehouses. Roadways also needed periodic repairs; in 63 AD the route leading from the Qilian Mountains, through Hanzhong (modern southern Shanxi), and towards the capital Luoyang underwent major repairs. For this project, 623 trestle bridges, five large bridges, 107 km (66 mi) of new roadways, and 64 buildings—including rest houses, post stations, and relay stations—were built. Those commissioned with military authority also built bridges. For example, during his campaign against the Xiongnu in the Ordos Desert in 127 BC, the general Wei Qing (d. 106 BC) had a new bridge built over the Wujia River (a former tributary of the Yellow River) in today's Inner Mongolia. He used this bridge to move troops and supplies for an attack on the Xiongnu, northwest of modern Wuyuan County (五原县). Ebrey writes: