Construction of Battery 113 began on March 23, 1942, and was completed on June 5; on August 10 it was renamed Battery Dunn in honor of Colonel John M. Dunn. The battery contained two Navy MkII 16-inch guns on M4 mounts. More than 600 feet long and built of reinforced concrete, it represented the evolution of coastal gun emplacement design. Before the 1940s, coastal artillery was largely unprotected against enemy fire and relied on dispersing the guns, but by the 1940s the army had begun encasing coastal artillery positions in concrete to protect them from aerial attack and shellfire from ships. The bunker was self sufficient with its own power, water, and ventilation systems. On February 7, 1947, it was placed on inactive status without ever having fired its guns in hostility, and the two 16-inch guns were removed two years later.
