Introduction to Ming and Wei Qing Cannons: The fourth unit "Ming and Wei Qing Cannons - Weapons of Ming and Qing Dynasties" is the most important display item of "Golden Arms and Iron Horses", which displays copper darts, iron maces, iron armors, iron armors, and locks. 114 pieces (sets) including Zijia, corbeled cannon, Hongyi cannon, general cannon, tiger-plated cannon, and iron cannon shells. Auxiliary exhibits include forts, musket structure diagrams, Ming Dynasty city maps, Ming Dynasty Xuzhou Guard excavation sites, and models of fully armed soldiers.