The last chapter was about reading the ground underfoot. This one is about an army collapsing on its own, whatever the ground.
Sun Tzu said a losing army takes six shapes. And he named their cause without hedging.
凡此六者,非天之災,將之過也
fan ci liu zhe, fei tian zhi zai, jiang zhi guo ye
These six are not a disaster sent by heaven. They are the commander’s fault. (The Art of War, Terrain, translated directly)