As we all know, we fought very hard in the War of Resistance Against Japan. The Japanese army relied on advanced equipment and mature training, and in the early days of the Anti-Japanese War, it had an advantage in the early stage of the war. 
It can be seen from several large-scale battles in the early days of the War of Resistance Against Japanese Aggression that our army fought against the Japanese army in the form of a group army, which was actually very unadvantageous. The Japanese army made ample preparations for this war of aggression. At the beginning of the war, the Japanese army had already found out a lot of information about our army, and in addition, the joint operations of the Japanese army's navy, land and air force led to our army suffering heavy losses. Therefore, people of insight at that time proposed another set of playing methods. 
As soon as this style of play appeared, the Japanese army had a headache. It is precisely the emergence of this style of play that gives us a glimmer of life to defeat the Japanese army. The Japanese army liked to attack cities, and after the occupation, they would send troops to garrison them. And on the periphery of the city, there are large villages. As soon as night falls, the residences of the Japanese soldiers and the garrisons of traitors in these villages will become the stage for our Eighth Route Army to show its style. 
At this time, the world is the world of my Eighth Route Army. At this time, at the stations of these Japanese troops, grenades would fly from all directions, and with a bang, they could even injure a few Japanese soldiers. These Japanese soldiers were made restless by our troops, and they did not dare to sleep, because they did not know when, the grenades flew again, and even if they were bombed, they did not dare to chase them, because they did not know how many people were waiting for them outside. 
This kind of operation was called Operation Cold Cannon at the time. This move of our army made the Japanese army lose their temper, and they had nothing to do but worry and fear all day long. Although the Japanese army was very advanced, it was defeated in the end. In addition to the invincible victory of evil over good, there is also the endless wisdom of our Chinese nation.