Kyle is worried about his pregnant wife, Anna, who is showing signs of stillbirth. One day, a mysterious portal opens, transporting him back to 1918. World War I is nearing its end. While in unfamiliar mountainous terrain, he comes across a tank brigade that has been ambushed and destroyed by partisans. On the battlefield, he learns that the cause of Anna's child's death has something to do with the sergeant who commanded the brigade. What did he see on the battlefield? Who was the sergeant?