 In 546, Gao Huan launched another major attack on Western Wei, putting Yubi (玉壁, in modern Yuncheng, Shanxi) under siege, intending to draw Western Wei forces to try to save Yubi, but Yuwen took no reaction to it, instead leaving Yubi's defense to the general Wei Xiaokuan.Wei ably defended Yubi, draining the strength of the Eastern Wei forces, and as Gao grew ill, Eastern Wei forces were forced to withdraw with major losses.Later in 546, Su died.