《金史·列传·卷九》
斡鲁也在高丽九城对面筑了九座城与之抗衡，兵马出城则作战，入城则防守，斡赛用这种办法与高丽对抗到底。
斡鲁亦对筑九城与高丽抗，出则战，入则守，斡赛用之，卒城高丽。
Wulu also built nine cities opposite Goryeo's nine cities to fight against it. The troops went out of the city to fight and defended when they entered the city. Wusai used this method to confront Goryeo to the end.