Kudara was an ally of Wakoku (later Japan), and Naka no Oe no Oji (later Emperor Tenchi), who was the political leader of the country at that time, dispatched troops to the Korean Peninsula in an effort to vigorously back up Kudara to restore.
倭国（後の日本）にとって百済は同盟国であり、当時の倭国の政治指導者である天智天皇（後の天智天皇）は、百済復興を強力に支援しようと、朝鮮半島へ出兵した。