 His wife, the Chinese princess Yicheng, sent her kinsman the emperor a secret warning about the attack but the emperor was only able to reach the commandery seat at present-day Daixian in Shanxi.The khan then put the town under siege on September 11.Emperor Yang was frightened, but Yu suggested that he try to restore the morale by announcing publicly that he was terminating the campaigns against Goguryeo and would award the soldiers greatly if they could lift the siege.