Manin's gun is where the spirit of patriotism of more than 10,000 civilian, government, and military doctors who died in the Battle of Namwonseong Fortress during the Japanese Invasion of Korea (1597). During the Japanese Invasion of Korea in 1592, the Japanese army, which judged that it could not invade Honam, invaded Jeonju Castle again in 1597, and the enemy's allies attacked Jeonju Castle and Namwonseong Fortress with 56,000 troops. In order to protect Namwonseong Fortress, the government had more than 1,000 soldiers led by Jeolla soldier Lee Bok-nam and 3,000 soldiers from both houses of the Ming Dynasty's deputy general guard Namwonseong Fortress. However, despite the fierce battle for their lives, more than 10,000 doctors, including 6,000 residents, died heroically after a struggle. After the war, the saints who returned from evacuation built Chungnyeolsa Temple in 1612 (the 4th year of Gwanghae) with their bodies in one tomb. After several relocations, it was purified in 1979 with the support of the government and the sincere dedication of all residents as part of the Hogukseonhyeon site purification project, and a 50-minute memorial tablet is enshrined at Chungnyeolsa Temple. On September 26 every year, the General Assembly of All People holds a memorial service for all doctors, honoring their noble will.