Around this time, Emperor Daowu also sought marriage and peace with Later Qin. However, Later Qin's emperor Yao Xing, hearing that he already had Empress Murong, refused, and because around this time Emperor Daowu constantly attacked several Later Qin vassals, the states' relations broke down. Emperor Daowu therefore began to prepare for a confrontation with Later Qin. Later in the year, Yao Xing did make a major attack against Northern Wei. In fall 402, Yao Xing's forward commander Yao Ping () the Duke of Yiyang was surrounded by Northern Wei's Emperor Daowu at Chaibi (柴壁, in modern Linfen, Shanxi), and despite counterattacks by both Yao Ping and Yao Xing, the Northern Wei siege became increasingly tighter, and in winter 402, Yao Ping and his army were captured following a failed attempt to break out, ending Yao Xing's campaign against Northern Wei.