Mashiling and Qitianling, two plateaus with an altitude of less than 350 meters, spread from left to right, forming a bulge in Japan's Dai Phong defense line. If the Japanese army wanted to counterattack, they had to flatten that ridge. first. Otherwise, mortar shells fired from here will be enough for them. Because of the importance of this prominent point, the 29th Regiment placed a company in each place. Compared to other plateaus that only have one or two platoons, not even one platoon, the strength of these two plateaus is very strong. . The two company commanders received orders from the regimental commander. Without thinking, they ordered: "Take off the clothes of these demons and hang them up!"