 He defeated the ally of five warlords (Wang Shichong王世充, Meng Haigong 孟海公, Gao Tansheng 高檀晟, Zhu Can朱灿 and Dou Jiande 窦建德) within one day.Two years later, another ally led by Liu Heita(刘黑闼), Xu Yuanlang(徐圆朗), Shen Faxing(沈法兴), Gao Kaidao(高开道) and Tang Bi(唐壁) invaded Tang Dynasty.Luo Cheng took part in this war and he was killed by a general in Liu Heita's troop, Su Dingfang (苏定方), with arrows.