 The armies stalemated, and in spring 561, unable to prevail over the Northern Zhou general Heruo Dun (賀若敦), Hou Tian offered to allow Heruo to withdraw with his army if he would yield the territory.Heruo agreed, and the territory became Chen possession.Seeking peace, Northern Zhou offered to return Chen Xu to Chen, and Emperor Wen, pleased, offered to trade the city of Lushan (魯山, in modern Wuhan, Hubei) for Chen Xu's release.