Earlier, more than a dozen units of Fortress 178's fighting forces had secretly left the forward operating base. For example, Zhou Yinglong had instructed the Razor Sharp Company to launch an attack on the Beiwan River on the pretense of heading out for their cross-country training. Then they never returned to base again. Likewise, the independent regiment Xu Xianchu was previously in was deployed to the western side of Blackstone River.
The deployment of these troops was actually to make it difficult for the spy to figure out the situation. Once these troops left the forward operating base, all communications with them would be handled personally by Wang Fengyuan.
Furthermore, Zhang Jinglin had stopped eating for two days and lost quite a bit of weight in order to deceive the spy as well.