On the morning of December 7, 1941, a fleet of Japanese carriers launched an air strike against the US Pacific Fleet at anchor in Pearl Harbor. The attack decimated the ships and personnel of the fleet and thrust the US into WW II.
The USS Arizona (the second of two Pennsylvania-class battleships – built in 1916) was moored on “Battleship Row.” Just before 8 am, the ship’s air raid alarm was sounded and the crew was ordered to general quarters. During the attack the Arizona was struck by as many as eight aerial bombs.
In addition, one 1,700-lb armor-piercing shell penetrated the deck and detonated in the powder magazine, causing a “cataclysmic” explosion “which destroyed the ship forward” and ignited a fire which burned for two days. It is thought that most of the Arizona crewmen who perished in the attack died instantly during the explosion. (DPAA)
After the attack, the Arizona was left resting on the bottom with the deck just awash. (U of Arizona) Within one week of the attack, divers surveyed the submerged portions of the ship to determine which parts could be salvaged. (DPAA)
One of the divers, Lt Col Lawrence M Guyer of the Hawaiian Seacoast Artillery Command (HSCAC), concluded that, from an artillery viewpoint, Arizona’s aft turrets 3 and 4 (with three guns each) were serviceable and capable of being used on land.
Guyer was credited with establishing numerous seacoast gun batteries on O‘ahu, including four batteries, each armed with two twin-gun 8-inch 55-caliber naval mounts removed from the aircraft carriers Lexington and Saratoga in early 1942.
Before the Japanese attack on Pearl Harbor, the coastal defenses for the island were considered extremely inadequate. Standard coast artillery then in production would have taken two to three years to procure, and Arizona’s 14-inch guns had much greater hitting power than the 6-inch and 8-inch guns being used on O‘ahu at the time. (John Bennett)
The Navy decided that the Army would receive gun turrets 3 and 4 for use as coastal defense guns. (NPS) In June 1942 the Hawaiian Department Engineer and representatives of the Hawaiian Seacoast Artillery Command examined potential sites on O‘ahu after the War Department gave preliminary endorsement to reusing both 14-inch naval turret batteries.
Two sites were selected: one at Mōkapu (Kāne‘ohe – to cover the eastern portions of O‘ahu) , and the other at Kahe, an area known today as Electric Hill (HEI generating plant) on the western shore of Oahu, up the slopes of the Waianae Mountains – to cover the south and west.
Arizona’s aft guns were removed in May 1942. Because the removal of the turrets began before any consideration was given to their reuse, no consideration was given to their reassembly, and no attempt was made to safeguard the integrity of the turret shells, which had been separated into two major components.
The Navy’s 150-ton heavy-lift floating crane transported Turret 4’s faceplate and slide assembly and the aft catapult to Waipio Point for safekeeping in early March 1942. The smaller turret components were removed from the Arizona, transported to the Pearl City Peninsula, and taken to a nearby yard and warehouse, where they were set aside for the salvage operation in May 1943.
Once ashore the equipment was disassembled completely; then the time-consuming task began – cleaning the small parts of corrosion caused by immersion in seawater for over a year. This included reworking and rewinding electrical motors and completely overhauling the hydraulic systems. (John Bennett)
Batteries Pennsylvania (at Mōkapu) and Arizona (at Kahe) were named on October 21, 1942, by a directive from Brig. Gen. Robert C. Garrett, commanding HSCAC. Garret approved the construction plans for both batteries on May 7, 1943.
The adjutant general of the army gave final approval to both projects on August 13, 1943, based on a Hawaiian Dept. letter of May 11, 1943, ‘Plan for Batteries Arizona and Pennsylvania.’
The most complex project undertaken during World War II at Mōkapu Peninsula was that of the construction of Battery Pennsylvania at Mōkapu Point.
Battery Pennsylvania is a 7-stories deep self-contained unit, gouged out of the side of Ulupa‘u Crater. It contains reinforced concrete rooms for radar, plotting, powder and shell storage and eating and sleeping quarters for approximately 160 troops. The battery was completely air conditioned.
Project engineers had to design a central concrete barbette well that extended 70 feet down in rock. The nucleus of the battery was the barbette (the gun mounting system): 42.5 feet in diameter and 70 feet deep.
To sustain a vertical load of 780 tons and a firing thrust of 2,620 tons, a heavy circular steel foundation ring supported the roller path, with radial webs anchored to the reinforced concrete barbette that ranged from nine to 15 feet thick.
The barbette contained three service levels; the first two levels were accessed from the powder and projectile magazines 70 feet below ground. Ammunition service was by a pair of naval-style shell skips powered by motor-winches that raised the shells from the floor of the magazine to the shell-loading platform in the turret 45 feet above.
The capacity of this room was 105 shells aboard ship; the number was increased to 150 at the batteries. A pair of powder hoists similar to those aboard ship raised the powder bags to the powder handling room, 25 feet above the magazine.
It took nearly four years to build the battery and reassemble the gun. In 1944, Army Ground Forces had scheduled Batteries Arizona and Pennsylvania to be manned by four officers and 157 enlisted men each when completed.
Battery Arizona’s construction was halted on August 1, 1945. Although the turret and guns had been mounted, the battery still lacked some components. It was not probable that it was turned over to the coast artillery and manned. The heavy guns at Battery Arizona were never test fired.
Only Battery Pennsylvania was fully completed; it was completed just before the end of the war in the Pacific. Battery Pennsylvania was test fired on August 10, 1945 (the only firing of its guns). (HABS) Today both sites are abandoned; the guns were removed and cut up for scrap shortly after the war ended. (Lots of information and imagery is from John Bennett.)




































































