In April 666, Tang was requested to dispatch their troops for conquest of Goguryeo, and attacks to Goguryeo were started after Tang appointed Li Ji to the supreme commander of the army to advance to Liaodong Province.
666年4月には唐に対して高句麗討伐の出兵を求め、唐は李勣を遼東道行軍大摠管に任命して高句麗への攻撃が開始された。