The Kwantung Army has the same name before and after. In fact, after the outbreak of the Pacific War, the main force of the Kwantung Army was transferred to the battlefield in Southeast Asia. Those who stayed in the Northeast were all new recruits, not the former ones. An elite group.

The reason why it could not be opened to the pass is because at that time, in large, medium and small battles, tens of thousands of people could be used to attack the national army. It was necessary to send so many more troops, and the logistics were tight.

In addition, the threat from the Soviet Union was in the north. In the Battle of Nomenkan, they suffered a loss and had to keep a large number of Kwantung Army in the Northeast.