Introduction to the Huns Castle: The Huns were brave and good at fighting. In addition to living in tents when migrating and fighting, they generally lived in watchtowers to defend themselves against the enemy. The angle between the walls of this preserved watchtower from the Yuan Dynasty is only 60 degrees, like the blade of a sharp sword piercing the blue sky; the walls are thick, the doors and windows are narrow, and arrows seem to be shooting out of the gun holes at any time; fully demonstrating the Xiongnu nation of imprint.