The Silla-Tang forces won a decisive victory, compelling Yamato Japan to withdraw completely from Korean affairs and crushing the Baekje restoration movement.

[1] Although the restoration forces had some initial success against Tang and Silla troops, by 662, they were in serious trouble, and their area of control was confined to the fortress of Churyu and its immediate vicinity.

Empress Saimei said: "We learn that in ancient times there have been cases of troops being asked for and assistance requested: to render help in emergencies, and to restore that which has been interrupted, is a manifestation of ordinary principles of right.

The troops were largely local strongmen (kuni no miyatsuko) drawn from mostly western Honshū, Shikoku, and especially Kyūshū, although some warriors were also from Kantō and northeastern Japan.

[6] Empress Saimei moved the capital to the Asakura temporary palace near the shipyards in northern Kyūshū to personally oversee the military campaign.

As the main fleet set sail, the Man'yōshū records Empress Saimei composing a waka:[7] Around August 661, 5,000 soldiers, 170 ships, and the general Abe no Hirafu all arrived in territory controlled by the Baekje restoration forces.

[10] On 5 October 663 (28 August by the lunar calendar), the second day of the battle, the arrival of Japanese reinforcements made their forces several times larger than the Tang fleet arrayed against them.

"[13] The battle, as well as all the preparation behind it, clearly illustrates (aside from any other documentation) the strong ties between Yamato Japan and Baekje of Korea transcending the usual interstate military, political, or economic interests.