Hamgyong campaign

The campaign was largely due to the help of Korean defectors who also handed over to the Japanese their princes Sunhwa and Imhae.

The Japanese reached the northeastern edge of Hamgyeong, crossed the Duman River, and attacked the Orangai Jurchens from Manchuria, but met with heavy resistance.

By winter local resistance began pushing back at Japanese occupation and laid siege to Gilju.

The North Army Commander Han Gukham led an attack on the Japanese and forced them to take shelter in the warehouse.

Katō then crossed the Duman River with 8,000 troops and 3,000 Korean defectors into the territory of the Orangai Jurchens.