It was not as easy to escape the battlefield as the Qing Sai Army had expected. After they left Nangeng City, a small group of elites from the Black Feather Army followed closely behind them. Liu Yizhao realised that the Black Feather Army had to obtain Shi Zuo City in the North Region, thus they took great pains to ensure that everything was settled.
Typically, there was no need for the Black Feather Army to kill the rest of the army, as the Qing Sai Army would no longer participate in the fight.
But the leader of the Black Feather Army could not relax. Their plans were too large. They could not risk a mishap back home. Thus, they had to resolve all of the hidden dangers.
Therefore, the Qing Sai Army walked around in the mountains and took half a month before they shook off the Black Feather Army. Then, they escaped towards King Lu Mountain at full speed.