Under the leadership of Yat and others, they went all the way over the hills and mountains. After walking for a long time, they finally came to a place where sand dunes gather. There are some old castles surrounded by some sand dunes and ancient walls. Because they have been eroded by wind and sand for many years, only a few relics can be found. However, unlike the former castles, there are countless tents and even a few Among them, the earth bag stands most prominently. In this tent group, there is a bamboo pole standing in the center. After years of weathering, the bamboo pole has been corroded, but...