Liao River
In April 645, General Li Shiji's army departed from Yincheng (present-day Chaoyang). On 1 May, they crossed the Liao River into Goguryeo territory. On 16 May, they laid siege to Gaimou (Kaemo), which fell after only 11 days, capturing 20,000 people and confiscating 100,000 "shi" (6 million liter) of grain.