In 663, Prince Naka no Oe dispatched troops to the Korean peninsula to help the Kingdom of Baekje (Kudara) rebuild the country, but the Japanese army was soundly defeated by the Silla -Tang allied forces in the battle of Hakusukinoe, at the mouth of Kum River.
663年、百済復興に助力するため朝鮮半島へ出兵したが、白村江の戦いで新羅・唐連合軍に大敗した。