The Japanese imperialists, who boasted about their mightiness, describing the Korean People's Revolutionary Army (KPRA) as "a drop in the ocean", were killed in the battles by the unique guerrilla tactics created by the President.

One day in May Juche 28 (1939), Kim Il Sung organized a an attack on Banjiegou, an important position for the Japanese imperialists' "punitive operations". At a meeting of commanding officers, he stressed the need to observe the time of launching the attack at any cost.

That day the moon was bright but just before the attack, it got dark suddenly. The members of the KPRA who took up an offensive position were very surprised. A lunar eclipse started. Enemies were all killed by the sudden attack by the KPRA. When the attack was completed, the moon got bright again. In fact, the President set the correct start and end time of the attack as he predicted that there would be a lunar eclipse.

The history of the anti-Japanese armed struggle records many battles proving the personality of the President as a peerlessly great man, including the battle of Fusong county town in which he won a victory with the tactic of appearing now in the east and now in the west in a flash, the battle in Mt Hongtou in which he won a great victory by driving the enemies into the trap valley, and the battle of the Duoguling Pass in which it was said that "Kim Il Sung carries his soldiers with leaves".

The President defeated the regular aggressor troops with his rare military wisdom and superb guerrilla strategy and tactics and thus achieved the historic cause of national liberation on August 15, 1945.