In 567, Zu, hungry for greater power, accused Zhao Yanshen, Gao Wenhao, and He Shikai of corruption and factionalism, but Zhao, Gao, and He Shikai received word of this prior to Zu's submission and make defenses of themselves first. Emperor Wucheng arrested Zu and interrogated him. During the interrogation, Zu offended Emperor Wucheng by pointing out that he should not be hoarding as many ladies in waiting as he had been and by comparing him to Xiang Yu—although as Zu then pointed out, Emperor Wucheng's accomplishments paled in comparison to Xiang's. Emperor Wucheng, angry, whipped Zu 200 times and had him imprisoned in a dungeon—and during that imprisonment, Zu's eyes, smoked by smoke from the lamp (which was burning Chinese cabbage seed as the light source) went blind.