Red culture introduction: The No. 1 fortress in the world is the Mengjiajing ruins. It has gone through battles such as the Battle of Taiyuan and the Battle of Taiyuan. It has undergone three large-scale repairs in history and was restored based on historical events. With the cooperation of the on-site staff acting as Japanese, they conducted role-playing, "fighting the Japanese once, being the Eighth Route Army once", which not only allowed them to truly appreciate the magical charm of the Eighth Route Army's tactics, but also subtly provided a vivid and touching patriotism education lesson.