In early 1942, the Japanese army launched a frantic sweep of the base area in northwestern Shanxi. In order to strike at the Japanese army's arrogance, Li Yunlong led an independent regiment to attack Ping'an County. Japanese troops from all directions came to rescue, and our army blocked them step by step. Li Zhenghu was ordered to lead the cavalry company to assist Kong Jie in defending Xuelang Valley. After a hard battle, they defeated the enemy, but unexpectedly discovered that a group of elite Japanese troops were treacherous and tried to sneak attack Li Yunlong's regiment through the dangerous terrain of Ghost Crying Valley. Li Zhenghu, Kong Jie and others rushed to Ghost Crying Valley, fought bloody battles, rescued the Chu Yunfei garrison of the Shanxi Suiyuan Army, which was under a fierce attack by the Japanese army, and bravely recaptured Ghost Crying Valley. Most of the Japanese army arrived immediately and launched a fierce attack. Li Zhenghu and others took out the spirit of the sword, relying on the unique terrain of Ghost Crying Valley, fought hard with the Japanese army, and made great sacrifices. In the end, the Japanese army was stubbornly blocked outside the Ghost Crying Valley, helping Li Yunlong's main attack force to successfully capture Ping'an County and severely damage the enemy...