 He first defeated Yuchi's general Xue Gongli (薛公禮), who was attacking Huai Province (懷州, roughly modern Zhengzhou, Henan), and then crossed the Yellow River north.He defeated Yuchi's son Yuchi Dun (尉遲惇) near Yuchi's headquarters at Yecheng and then put Yecheng under siege.The city soon fell, and Yuchi Jiong committed suicide.