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Battle of Corregidor

1942 battle of World War II, during the Japanese invasion of the Philippines

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The fall of Bataan on 9 April 1942 ended all organized opposition by the United States Army Forces in the Far East 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 armaments, along with the fortifications across the entrance to Manila Bay, was the remaining obstacle to the Japanese Fourteenth Area Army of Lieutenant General Masaharu Homma. Homma had to take Corregidor because as long as the island remained in American hands, the Japanese would be denied the use of Manila Bay and its harbor. The U.S. Army eventually surrendered the Philippines in 1946.

Background

Gibraltar of the East

Corregidor, named Fort Mills, was the largest of four fortified islands protecting the mouth of Manila Bay and had been fortified prior to World War I with powerful coastal artillery. Some 4 mi (6.4 km) long and 1.5 mi (2.4 km) across at its head, the tadpole-shaped island was 3.5 mi (3.0 nmi; 5.6 km) from Bataan. Its widest and elevated area, known as Topside, held most of the fort's fifty-six coastal defense guns and mortars, and twenty-eight 3-inch antiaircraft guns, besides the three-story "Mile-Long Barracks." Middleside was a small plateau containing battery positions as well as barracks. Bottomside was the lower area, where a dock area and the civilian town of San Jose were located, besides the controlled-mine complex. Americans called it "The Rock", "Fortress Corregidor" or even the "Gibraltar of the East", comparing it to the fortress that guards the entrance to the Mediterranean Sea between Europe and Africa.

The tunnel system under Malinta Hill was the most extensive construction on Corregidor. It contained a main east–west passage 1,400 ft (430 m) long and 30 ft (9.1 m) wide, with 25 lateral passages, each about 400 ft (120 m) long, which branched out at regular intervals from each side of the main passage. A separate system of tunnels north of this housed the underground hospital with 12 laterals of its own. The facility could be reached either through the main tunnel or by a separate outside entrance on the north side of Malinta Hill. The Navy tunnel system was located south of the quartermaster area that extended south of Lateral 8. Petrol was stored near the west entrance, while General MacArthur's headquarters was located in Lateral 3, next to General George Moore's headquarters in Lateral 2, and President Quezon's quarters next to the east entrance. Reinforced with concrete walls, floors, and overhead arches, it also had blowers to furnish fresh air and an electric trolley along the east–west passage.

Defenses

The defensive arsenal on Corregidor was formidable with 45 coastal guns and mortars organized into 23 batteries, some 72 anti-aircraft weapons assigned to 13 batteries and a minefield of approximately 35 groups of controlled mines. Batteries Wheeler and Crockett each had two12-inch Gun M1895s, while Batteries Smith and Hearn had a single gun each. Battery Way had four 12-inch coast defense mortars while Battery Geary had eight. Battery Grubbs had two 10-inch gun M1895s, while Batteries Morrison, Ramsay and James had 6-inch gun M1905s, two, three and four respectively. Batteries Maxwell Keyes, Alonso Cushing and Guy B. Hanna had two 3-inch gun M1903.

Caballo Island, with Fort Hughes, 2.5 miles (4.0 km) south of Corregidor's lighthouse, with an area of 75 acres (30 ha), rises to a height of 381 ft (116 m). Battery Woodruff had a single 14-inch gun M1910, Battery Craighill had four 12-inch M1912 mortars, Battery Leach had two 6-inch gun M1908s, while Battery Fuger had two 3-inch gun M1903s.

Fort Drum (El Fraile Island) is 6.3 mi (10.1 km) southeast of Corregidor's lighthouse. Batteries Marshall and Wilson had two 14-inch gun M1909s each, while Batteries Roberts and McCrea had two 6-inch gun M1908s each.

Fort Frank on Carabao Island is 8.1 mi (13.0 km) south of Corregidor's lighthouse, near the Cavite shoreline, and rises 180 ft (55 m) above the sea. Batteries Greer and Crofton have single 14-inch gun M1907s, while Battery Koehler has eight 12-inch gun M1908s, and Battery Hoyle has two 3-inch guns.

All four forts in Manila Bay—as well as Fort Wint in Subic Bay—had been formed before the war into an organization called the Harbor Defenses of Manila and Subic Bays, which by August 1941 became a part of the Philippine Coast Artillery Command. Both were under Major General George F. Moore. The 5,700 men of the Harbor Defense Force were assigned to four coast artillery (CA) regiments: the 59th, 60th, 91st, and 92nd CA (the 60th CA being an antiaircraft artillery unit and the 91st and 92d CA Philippine Scouts units). About 600 Philippine Army soldiers in training were organized into the 1st and 2nd Coast Artillery Regiments (PA) but operated under the control of the two PS regiments. Moore organized the force into four commands to exercise tactical control: (1) seaward defense, and (2) North and South Channels defense, under Colonel Paul D. Bunker; (3) anti-aircraft and air warning defenses under Colonel Theodore M. Chase, and (4) inshore patrol under Captain Kenneth M. Hoeffel of the US Navy. Fort Frank had a garrison of 200 men, Fort Hughes 800 men, and Fort Drum 200.

On 24 December, Subic Bay was abandoned along with Fort Wint. On 29 December, after evacuating Olongapo, Subic Naval Base, Samuel L. Howard's 4th Marine Regiment became the primary fighting unit on Corregidor. Curtis T. Beecher's The 1st Battalion held the tail of Corregidor, the 3rd Battalion the middle of the island, and the 2nd Battalion defended the western end, while Schaeffer's 4th Battalion was held in reserve. Of Howard's 3900 men, only 1500 were marines, the remainder was composed of various Army, Navy, Philippine Army and Philippine Scouts.

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