 He was so strong that normal opponents would flee away after hearing his name.In the battle of Siming Mountain, Yuwen Chengdu, alone, fought against the allies of Wu Yunzhao, Wu Tianxi and Xiong Kuohai, for a whole day, and eventually defeated the allies.He was generally regarded as a hero, but he was negatively influenced by his family, especially his father Yuwen Huaji, who killed Yang Guang, the emperor of Sui Dynasty, in a military rebellion.