On the surface, Guo Songling is highly valued by Zhang. But many people look down on Guo Songling and think that it is a mistake for Zhang Zuolin to reuse him. Guo Songling has also been greatly excluded here, feeling that he is useless here and doesn't get along with this mob. Working under Zhang, he always feels wronged and always wants to find an opportunity to set up his own group.
Zhang sent Guo Songling to attack Feng Yuxiang's army. Feng Yuxiang's affection for Guo Songling has a long history, so they talked about many things privately and finally reached an alliance. Guo Songling rebelled, which Zhang never expected. His beloved Guo Songling turned over and surrendered to Feng Yuxiang. So Zhang fell into a huge crisis, but he didn't panic, because he knew that Guo Songling was definitely no match for him.
Guo Songling's judgment is a bit unreasonable. He has no reason to oppose Zhang's rule. If it is only to satisfy personal desires, then no one wants to follow him to attack his lair. His soldiers are all from the northeast, and no one wants to kill each other. The relatives, property and roots of these soldiers are all in the northeast. They are unwilling to oppose Zhang unless they are given an irresistible reason.