Yunfu is located in the Cangyu Mountains, with soldiers approaching Lushui. It can be attacked when advancing and defended when retreating. It is indeed an excellent place to use troops. If you advance, you can take the Southern Dynasty to the east; if you retreat, you can stick to the natural dangers. Many years ago, Emperor Xuanqin of the Southern Dynasty came to Yunfu as a proton, and when he reached Lushui, his guards once told him that if he could obtain the danger of the mountains and rivers here, there would be no need to worry about failing to achieve his great cause.