 He also sent messengers to Luo, trying to persuade Luo to submit.Luo, believing both Dou and Gao Kaidao (who also tried to get him to submit) to be simply bandits, instead submitted to Tang.Dou led his forces against Luo, but could not capture Luo's base at You Prefecture (幽州, converted from Zhuo Commandery) and had to withdraw.