The defeat at Lan Giang Khau made the Viet Minh realize that compared to the French army, they were still too immature, not only inexperienced soldiers but also very inexperienced generals, simply incapable of confronting the enemy head-on. French army. . Therefore, under the strong support of Ruan Aiguo, the Viet Minh assigned command to Zhong Wei. Zhong Wei was honest and straightforward, and immediately began reorganizing and training the Viet Minh army, and sent a large number of Japanese mercenaries into South Vietnam through the jungles of Laos. and Cambodia, where they waged a guerrilla war and continuously harassed the French rear. Soon, the French army was surrounded by fire, gunfire and explosions that did not stop for a day. Japanese mercenaries are well equipped, strong and extremely skilled in tropical rainforest guerrilla warfare, using the rainforest as a base to continuously attack and ambush French army troop transports, surrounded French army bases, attacked ports, roads and airports. suffered heavy casualties. There were no large-scale battles, but the French army killed up to 3,000 people each month, heavy casualties that terrified all of France!