[Resist US aggression and aid Korea + time travel + reconnaissance interspersed + passionate military + no system] In the Korean battlefield in 1951, modern reconnaissance sergeant Wei Changchuan opened his eyes and was pinned down in a frozen ditch by a U. S. Military machine gun. The platoon leader was seriously injured in the abdomen, and the radio was damaged and could not reach the main force. There were twelve people in the platoon, two wounded, three boxes of machine gun ammunition, and four grenades. Behind him was a large force waiting to pass by, and in front was the enemy's firepower blocking the mountain pass. He didn't have a system or unlimited supplies, so he could only replay the more than ten seconds of gunshots he had just experienced in his mind, looking for a way to survive from the echoes and bullet marks. Touch the sentry post, seize the fork, cut off the retreat, and seize the passage. When the follow-up troops rushed through the mountain pass, they discovered that this small reconnaissance platoon had already penetrated the enemy's mountain pass defense line.