Wang Geon's naval raids in the Naju region, which have worked to disrupt trade and diplomatic ties with Southern Chinese kingdoms, have troubled Hubaekje for much of its existence by .

Hubaekje possesses considerable military strength, and Lee (1984, p. 99) writes of Gyeon Hwon that "Had Gung Ye and Wang Geon not stood in his way, he surely would have had little difficulty in toppling Silla."

Hubaekje shows its greatest strength in 927.

In this year, its armies attack and pillage the Silla capital at Gyeongju, slaying King Gyeongae and establishing King Gyeongsun as the ruler.

Before the attack, Silla had sent for aid from Goryeo, and Wang Geon arrives with a large army shortly after Gyeongju was taken.

The two armies meet near Palgong Mountain in present-day Daegu.

Wanggeon's forces in the battle reportedly number ten thousand men.

Hubaekje triumphs, and Wanggeon himself only escapes through the daring self-sacrifice of his general Shin Sung-gyeom and Kim Nak.