The story is based on the "Yiyuan Resistance Data" real war stories, about the resistance war period in Shandong military region special battalion in the mushroom mountain to protect the security of the Shandong combat command centre from the siege and the Japanese in a fierce battle, the instructor Tang Jianheng pull grenades and the Japanese with the death of the battalion commander Yan Yulin received the order to lead the troops on the top of the hill to hold on to the last 20 minutes, and ultimately in the completion of the task of running out of food and comrades with the sacrifice of 14 people fearlessly!