Before reaching his destination, Yu Jin learnt that the Qingzhou Corps (), an elite unit in Cao Cao's army composed of former Yellow Turban rebels, had taken advantage of the chaos to pillage villages along the way. He then led his men to attack and punish the Qingzhou soldiers. Some Qingzhou soldiers managed to flee to Wuyin County, meet Cao Cao, and falsely accuse Yu Jin of committing the atrocities they were responsible for. When Yu Jin reached Wuyin County, instead of going straight to meet Cao Cao and explain himself, Yu Jin immediately went to set up defensive fortifications around Cao Cao's camp because he knew that Cao Cao, given his wisdom, would not believe the Qingzhou soldiers' lies so there was no rush for him to explain himself. He also thought that it was more important to strengthen their defences in case Zhang Xiu attacked again. Yu Jin was proven right; Cao Cao also praised and rewarded him for his efforts.