wers. When the Xiongnu attacked, they immediately relied on their fortified cities to defend themselves, not giving the Xiongnu even a chance.Now Jiuyuan is also employing this strategy. With the heav...The emergence ofly one army arrives, it can hold out for several months. But if the Xiongnu armies on the central and right flanks arrive simultaneously at Chang'an City, the situation will be precarious.After this i...