Initially , the imperial forces were scoring victories over Weibo forces .
After Tian flattered Li Zhengji in a humble letter , Li Zhengji withdrew from the campaign , causing other imperial generals south of the Yellow River to hesitate to advance as well .
Initially , the imperial forces were scoring victories over Weibo forces , but after Tian flattered Li Zhengji in a humble letter , Li Zhengji withdrew from the campaign , causing other imperial generals south of the Yellow River to hesitate to advance as well .