Anti-Japanese War: I Became a Nightmare for the Japanese Army

[Anti-war time travel + modern tactics + iron-blooded troops + no system] When he opened his eyes, He Rui was lying in the mountain of corpses and sea of blood on the Xinkou battlefield. There is no system around him, no unlimited ammunition, only a medium-sized army and three approaching Japanese soldiers. Since God asked him to go back to 1937, he was not prepared to live a useless life. If you can't defeat them, dig trenches. If you don't have enough firepower, grab the enemy. If your troops are not strong enough, then you can personally train an elite force. From a trainee platoon leader to a fierce general, from a defeated soldier to a mighty army. The Japanese thought they were still facing the Chinese army with backward equipment and outdated tactics. It wasn't until the artillery shells hit the position that they discovered—— This Chinese officer seemed to know how to fight better than they did.