In 1941, dark clouds rolled over the city on the northeastern border. The Kwantung Army's Hutou Fortress is well fortified and heavily fortified, hoping to rely on the Changbai Mountain defense line to hold it for a long time. The nine-member elite anti-alliance team circled deep in the mountains and dense forests, repeatedly attacking the enemy's communication lines, firepower points and intelligence networks.
Just after a victory in a pass ambush, the team welcomed the superior airborne intelligence specialist Su Yanqiu in the secret camp, and received a special top-secret mission: sneak into the enemy-occupied city of Mudanjiang, capture the families of high-ranking Japanese military officers, and destroy the communication terminal, oil supply center and border intelligence liaison station.
At this time, there are traitors hidden within the underground organization, there are many sentries outside the city, and there are dense spies inside the city. The field battle in the mountains and forests turned into a lurking in the city, and the nine soldiers walked on thin ice. Relying on their rich combat experience, excellent special warfare skills and the life-and-death trust among their comrades, they opened a gap in the enemy-occupied hinterland to contain the enemy forces on the eastern front and create opportunities for the subsequent main counterattack.
