He died on Achasan as Baekje's capital in the present-day Pungnaptoseong region fell to the northern rival kingdom Goguryeo.
In 469, he ordered a surprise attack in which the city of Cheongmongnyeon (청목령, 靑木嶺 ; near modern Kaesong) was retaken from Goguryeo.
However, these advances were rebuffed by the Wei court, which tried to avoid war with Goguryeo which had greater military power at the time, while fighting against Southern Dynasties.
Dorim used Gaero's passion for the game of baduk to ingratiate himself, and persuade the king to neglect the country's defense in favor of public works.
[1] In 475, Jangsu launched an attack with 30,000 men and overran Baekje's defenses in seven days, taking the Han River valley including the capital.