In Shanghai, 400 Chinese soldiers and their allies are tasked with fending off 20,000 Japanese invaders while guarding the Sihang Warehouse. This is where the story's action takes place. The soldiers, known as the "Savage 400," must fight to survive and maintain their position in the face of improbable odds. The film explores the courage, sacrifice, and tenacity exhibited by these men as they endure four days of nonstop shelling without much hydration or food this story.