The Inscription on the Gwanggaeto Stele said that, as far as a reading according to a commonly accepted theory, Wakoku progressed in leading the Japanese militaristic advance into the Korean Peninsula to make Paekche and Silla serve as vassal countries and had a furious battle with Koguryo.
また、広開土王碑文も、通説に従って読む限り、碑文にある、倭が朝鮮半島に進出して百済や新羅を臣従させ、高句麗と激しく戦っていたこと、とする。