See J. and W. Belote, Corregidor: The Saga of a Fortress (1967).
Because of its rocky landscape and the fortifications of Fort Mills, the island was also known as "the Rock".
Corregidor is four miles (6 km) long and about at its widest point, with a total area roughly about three square miles. Its bulbous head, which points towards the South China Sea rises prominently to a large flat called Topside. This was the nerve center of the Island and here was located the headquarters, barracks for enlisted personnel, officers quarters, underground ordnance shops, the traditional parade grounds, and the bulk of the batteries that constituted the strength of Corregidor.
Bottomside is the lower part of the island and is the neck that connects the tail and head of the island. South of Bottomside is Barrio San José (near what was Navy Beach); on the north is what was Army Dock, with its three large piers, and, east of Bottomside, is Malinta Tunnel.
In 1902, the island was organized as an American military reservation. In 1903, a convalescent hospital was established by the US Army.
In 1908, a Regular Army post was established on the island, designated as Fort Mills, in honor of Brigadier General Samuel M. Mills, Chief of Artillery of the US Army from 1905 to 1906. By early 1909, H Company of the 2nd Battalion of the Corps of Engineers was assigned to Corregidor and started on the construction of concrete emplacements, bomb-proof shelters, and trails at various parts of the island. This pioneer engineer company left Fort Mills on March 15, 1912.
The defense of Corregidor was the immediate responsibility of the Philippine Coast Artillery Command under Major General George F. Moore. Stationed on the island were the following regular units:
Before the outbreak of World War II, the island was reinforced by the 4th Marine Regiment and by mobilized Philippine Army troops which were sent to reinforce the island's beach defenses.
The Army post on Corregidor was named Fort Mills, that on Caballo Island, Fort Hughes, on El Fraile, Fort Drum, and on Carabao Island, Fort Frank. According to the war plan, these forts were supposed to be able to make a six-month stand, after which aid would presumably come from the United States. The fortifications on Corregidor were designed solely to beat off a seaborne attack. When American military planners realized that airplanes would one day render Fort Mills obsolete, the United States was restricted from improving the fortifications by the Washington Naval Treaty of 1922. After this, U.S. Army constructed the Malinta Tunnel, with its series of related laterals, to protect its military stores and vital installations in the event of war.
The island, which sheltered Fort Mills, was a prized piece of real estate. Its defense installations had cost the U.S. Government more than 150 million dollars. This amount did not include the expenditure for fortifying the neighboring islands of Caballo, Carabao, and El Fraile, on which were established forts Hughes, Frank, and Drum, respectively.
The Battle for Corregidor was the culmination of the Japanese campaign for the conquest of the Philippines. The fall of Bataan in April 9, 1942 ended all organized opposition by the U.S. Army Forces – Far East (USAFFE) to the invading Japanese forces on Luzon in the northern Philippines. The island bastion of Corregidor, with its network of tunnels and formidable array of defensive armament, along with the fortifications across the entrance to Manila Bay, was the remaining obstacle to the 14th Japanese Imperial Army of Lieutenant General Masaharu Homma. The Japanese had to take Corregidor; as long as the island remained in American hands, they would be denied the use of the Manila Bay, the finest natural harbor in the Orient.
The Battle for the Recapture of Corregidor, between 16 February and 26 February 1945, by American and Filipino liberation forces against the defending Japanese garrison on the island fortress used by the USAFFE, which was the last bastion to surrender to invading Japanese forces in 1942.''
The longest-range coastal pieces were the two guns of Batteries Hearn and Smith, with a horizontal range of . Although capable of an all around traverse, these guns, due to their flat trajectories, were not effective for use against targets on Bataan.
During the siege, the island had ample armor-piercing ammunition but very little of the anti-personnel type, which then was of greatest demand for use against land targets on Bataan. In fact, most of the anti-personnel shells were only for the 12-inch mortars of Batteries Way and Geary.
Battery Way was named in honor of the Coast Artillery Corps of the U.S. Army, which along with Battery Geary, was the mainstay of the Corregidor Garrison during the Japanese invasion. Its mortars, capable of a 360-degree traverse, could fire on land targets at Bataan. They brought the most destruction on Japanese positions during the attempted landings on the southwest coast of Bataan late in January to the middle of February 1942. These mortars were silenced by enemy shelling in May 1942.
After the War, many people, most of them veterans, visited the island because of its history. Today, Corregidor is a historic monument as well as a tourist destination. Many travel companies offer day tours on the island featuring military installations used during World War II. Most of the war-ravaged buildings have not been restored, but have instead been left in reverence to the Filipino and American soldiers who died there. Standing on the highest part of Corregidor's west side is the Pacific War Memorial, which was built by the United States Government to honor the Filipino and American soldiers who participated in World War II. It was completed in 1968 at the cost of three million dollars.
The Malinta Tunnel, which is the last stronghold of the joint Philippine and American military prior to the Japanese takeover during the last world war, is now home to an audio-visual presentation by National Artist Lamberto V. Avellana of the events that took place on the island, including the reluctant departure of General Douglas MacArthur and the evacuation of the Philippine president Manuel L. Quezon and his family to unoccupied areas of the Philippines and then to exile in the United States.
One of the most recent additions to Corregidor is the Filipino Heroes Memorial. This 6,000-square meter complex has 14 murals depicting heroic battles fought by Filipinos from the 15th century up to the present day. It was designed by Francisco Mañosa, while the murals and a statue of a Filipino guerrilla were sculpted by Manuel Casas. The complex was inaugurated by President Fidel V. Ramos on August 28, 1992.
Once every May 6 at exactly noon, the Solar equinox would light the center of the altar and visitors are required to have a moment of silence since this is the exact time Corregidor and the Philippines fell into the hands of the Japanese.



