Introduction to Donghong Fort: Donghong Fort was built from 1889 to 1890. It is equipped with two 24-cm caliber flat-firing cannons, two 12-cm-caliber flat-firing cannons, and two 7.5-cm-caliber cannons. The tunnel is a masonry structure with an arched roof. The highest point is 4 meters and the width is 3.2 meters. The average height and width are about 2.6 meters. Have good ventilation equipment. The barracks are at the exit of the tunnel and are built against the mountains. They are well hidden and strong. The houses are connected to each other. There are 7 doors for easy entry and exit. Each barracks is about 22 square meters. During the Sino-Japanese War of Sino-Japanese War, the fort was destroyed by artillery fire and was later restored.