In spring 908 , Li Keyong himself fell deathly ill , forcing Zhou to withdraw back to Taiyuan .
Li Keyong initially sent Zhou Dewei to try to lift the siege , but was unable to do so .
In spring 908 , Li Keyong himself fell deathly ill , forcing Zhou Dewei to withdraw back to Taiyuan .
Li Keyong initially sent Zhou Dewei to try to lift the siege , but was unable to do so .