This facility was constructed in 1940 by the Japanese army in response to the armed defense of the original Japanese Taichung Airfield (now Shui Nan Airport). Its gunfire network could suppress the flat, open terrain on the east side of the airfield, and it served as a machine gun bunker, commonly referred to as a “machine gun fort.” The structure is a conical concrete construction with a base diameter of about 10 meters and a height of roughly 6–9 meters. The walls contain several rectangular windows. The article is excerpted from the Taichung City Cultural Heritage Office.