Battery names

The name sources for the batteries at Fort Mills were:^[16]

12-inch (305 mm) mortars of Battery Way in 2007

12-inch (305 mm) gun on a disappearing carriage, generally similar to Batteries Cheney, Wheeler, and Crockett

12-inch (305 mm) M1895 gun of Battery Hearn circa 2010

Japanese landings on Corregidor, 5–6 May 1942

Japanese troops celebrate the capture of Corregidor and the Philippines at Battery Hearn, May 1942

Minefields

Manila Bay and Subic Bay had Army-operated minefields as well as naval mines. These minefields were designed to stop all vessels except submarines and shallow-draft surface craft. In Manila Bay, two controlled minefields were placed, one extending west from Corregidor to La Monja Island, and the other extending north from Corregidor to the Bataan Peninsula east of Mariveles Bay. Both of these were operated from Corregidor. Also, in mid-1941 US Navy minefields of contact mines were laid between Mariveles Bay and La Monja Island, and between Corregidor and Carabao Islands, to close off the bay approaches not covered by Army mines.^[10][2][17]

On the night of 16–17 December 1941 the passenger ship SS Corregidor (formerly HMS Engadine) hit a mine and sank near Corregidor Island. The ship departed Manila that night without obtaining permission from the US Navy's Inshore Patrol, which meant the minefield operators were not alerted that a friendly ship was departing the harbor. The minefield's usual state in wartime was active, which meant they would detonate on contact. This probably applied to the mines in the designated ship channel as well. When the ship was spotted, some accounts state that Colonel Paul Bunker, commander of the Seaward Defenses, ordered that the minefield remain active. Due to wartime conditions, no official investigation was ever conducted, leaving many questions open. The location at which the ship sank has not been determined, for example.^[18] Accounts state that US Army officers informally told Filipino reporters that the mines were placed in safe mode immediately after the sinking. The ship was crowded with 1,200 to 1,500 persons, mostly Filipino civilians evacuating to Mindanao. 150 Philippine Army personnel and seven Americans were on board, along with several 2.95-inch mountain guns badly needed by the forces in the southern Philippines. Three PT boats (PT-32, PT-34 and PT-35) picked up 282 survivors, of which seven later died.^{[17][19][20][21]}

The Malinta Tunnel

The main part of the Malinta Tunnel complex was built on Corregidor from 1932 to 1934, with construction continuing until the Philippines were invaded in December 1941. Most US forts of this era had only small underground facilities, and this tunnel complex was the largest in the US coastal defense system. Due to the Washington Naval Treaty's prohibition on new fortifications, most of the complex was built without appropriated funds, using Filipino convict labor for unskilled tasks, and explosives slated for disposal. During the siege, the Malinta Tunnel proved important to the survival of the Philippine government, the military high command, the medical staff, and numerous civilians.^[22]

Prelude

From the late 1930s through the surrender in 1942 a number of batteries for 155 mm (6.1 in) GPF guns^[23] were built at Fort Mills. These were mobile field guns adopted by the Coast Artillery Corps for use in "tractor-drawn" units, such as the 92nd Coast Artillery. At least a few of these were delivered to the Philippines in 1921 with transfer of the 59th Coast Artillery to the islands.^[24] Nine batteries with emplacements for 22 guns were built.^[3][8] The US Army's official history states that 19 of these weapons were on Corregidor during the final battle in 1942. Most of these batteries simply had "Panama mounts", circular concrete platforms to stabilize the gun on its mobile carriage. One battery was exceptional, Battery Monja in the southwest part of Corregidor, with two emplacements. One or both of these were casemated by being built into a rock face; this proved to be crucial to the battery remaining in action during the siege. By December 1941 there were seven antiaircraft batteries totaling 28 3-inch guns on Corregidor (including one nearby on Bataan), some manned by the 60th Coast Artillery (AA) and some manned by batteries of the harbor defense regiments.^[25][26]

On 26 July 1941 Lieutenant General^[27] Douglas MacArthur was recalled to active duty and made the commander of U.S. Army Forces in the Far East (USAFFE), which included the Philippine Scouts and the Philippine Commonwealth Army. MacArthur had been an official U.S. advisor to the Philippine forces as a Philippine Field Marshal from 1935 to 1937, and had continued this function as a civilian since his retirement from the U.S. Army at the end of that period.^[28]

The siege begins

The Japanese invaded northern Luzon a few days after the attack on Pearl Harbor on 7 December 1941 that brought the US into the war. They advanced rapidly, with other landings elsewhere, notably at Legazpi in southeast Luzon on 12 December, Davao on Mindanao on 20 December, and Lingayen Gulf on 22 December. On 26 December 1941 Manila was declared an open city, with the Philippine government and MacArthur's headquarters evacuated to the Malinta Tunnel. Amid the evacuations, a re-inauguration ceremony for Philippine President Manuel Quezon's second term was held just outside the tunnel on 30 December.^[29] The Japanese entered Manila on 2 January 1942.^[30] Five days later the U.S. and Philippine forces completed a fighting withdrawal to the Bataan peninsula, northwest of Corregidor, and prepared to defend it. In the northern Philippines, this left only Bataan, Corregidor, and Forts Hughes, Frank, and Drum in Allied hands.^[31] This situation had been anticipated in the prewar War Plan Orange-3, under which the forces in the Philippines were expected to hold out at the mouth of Manila Bay for six months. By that time it was anticipated that a relief expedition from the U.S. might arrive. General MacArthur had hoped to defend the Philippines more aggressively under the Rainbow Plan, and was able to get some reinforcements in the months prior to the U.S. entering the war, but this fell apart with the rapid Japanese advance in December 1941. And, with almost all of the Pacific Fleet's battleships sunk or damaged at Pearl Harbor, and the Japanese advancing in several parts of Southeast Asia at a much greater rate than expected, no relief was organized. Although extensive guerrilla operations were conducted by Filipinos with U.S. support, U.S. forces did not return to the Philippines in strength until the invasion of Leyte Gulf in October 1944.^[32]

One aspect of MacArthur's Rainbow Plan was the Inland Seas Project, intended to defend a shipping route to keep his forces supplied. Part of this was a buildup of Philippine Commonwealth forces, and a projected deployment of coast artillery weapons manned by them in the central Philippines. In 1940-41 eight 8-inch (203 mm) railway guns and 24 155 mm (6.1 in) GPF guns were delivered to the Philippines, without crews as they were to be locally manned. The 8-inch guns were sent north in December 1941 to engage the invading Japanese forces, but six of them were destroyed by air attack. One gun was eventually placed on a fixed mount as Battery RJ-43 on Corregidor in March 1942; the other may have been at Bagac, Bataan. Reportedly the Corregidor gun fired only five proof rounds, then went unused for lack of a crew until knocked off its mount by bombing or shelling. The history of the Bataan gun is unknown. Most or all of the 24 155 mm GPF guns were eventually deployed at Corregidor and/or Bataan.^[33][34]

Fall of Bataan

Although the US and Filipino forces achieved success in defending Bataan through the end of February,^[35] they had taken 50 percent casualties and were worn out and poorly supplied.^[36] Also, the British fortress of Singapore had surrendered on 15 February, and the Japanese had taken several major islands of the Dutch East Indies, essentially preventing any reinforcement of the Philippines. Philippine President Manuel Quezon, with his family and senior officials, was evacuated to the southern Philippines by the submarine USS Swordfish (SS-193) on 20 February.^[37] MacArthur was ordered by President Franklin D. Roosevelt to relocate to Australia to prevent his capture and to direct further operations. He departed Corregidor on 12 March 1942, initially by PT boat to Mindanao, completing his journey by air. On 20 March he made a speech with the famous phrase "I shall return". He left Lieutenant General Jonathan M. Wainwright IV in a subordinate command in the Philippines, telling the key officers there that he (MacArthur) would control the Philippines from Australia. However, he neglected to inform Washington of this arrangement, and Washington intended Wainwright to be in charge. It was not until 20 March that the extent of Wainwright's authority and degree of independence from MacArthur was clarified by a message from General George C. Marshall, the Army chief of staff.^[38]

The Japanese in Bataan received substantial reinforcements and replacements in March, including 240 mm howitzers and aircraft, and prepared for an offensive scheduled for 3 April.^[39] It started with a five-hour air and artillery bombardment that destroyed many of the Allied defensive positions and stunned the defenders; a three-day assault threw them back along much of the line.^[40] On 6 April the US and Filipino forces attempted a counterattack, which ran into a fresh Japanese attack that eventually threw the Allies further back.^[41] Over the next two days many Allied units disintegrated, and on 9 April the Allied forces on Bataan surrendered.^[42] About 2,000 stragglers made it to Corregidor, while about 78,000 became prisoners of the Japanese and were transferred to camps in northern Luzon on the Bataan Death March.^[43]

Fall of Corregidor

Corregidor had been bombed intermittently since 29 December 1941. Supplies on the island were short, with food and water severely rationed and the defenders correspondingly weakened. Japanese artillery bombardment of Corregidor began immediately after the fall of Bataan on 9 April. It became intense over the next few weeks as more guns were brought up, and one day's shelling was said to equal all the bombing raids combined in damage inflicted. However, after an initial response from a 155 mm GPF battery, Lt. Gen. Wainwright prohibited counterbattery fire for three days, fearing there were wounded POWs on Bataan who might be killed.^[44] Japanese aircraft flew 614 missions, dropping 1,701 bombs totaling some 365 tons of explosive. Joining the aerial bombardment were nine 240 mm (9.45 in) howitzers, thirty-four 149 mm (5.9 in) howitzers, and 32 other artillery pieces, which pounded Corregidor day and night. It was estimated that on 4 May alone, more than 16,000 shells hit Corregidor.^[45] Forts Frank and Drum had been bombarded from the Pico de Loro hills on the Cavite shore since 6 February by a gradually increasing Japanese artillery force.^[46]

On 3 February 1942 USS Trout (SS-202) arrived at Corregidor with 3,500 rounds of 3-inch anti-aircraft ammunition. Along with mail and important documents, Trout was loaded with 20 tons of gold and silver previously removed from banks in the Philippines before departing.^[47]

By the end of April Corregidor's main power plant was too damaged to function most of the time. This was needed for the ammunition hoists of the disappearing gun batteries, which had gasoline-powered generators but for which fuel could not be spared. The Malinta Tunnel had its own generators, but sometimes these failed too.^[48] The bombardment by high-angle artillery and aircraft gradually destroyed the utility of almost all of Corregidor's big guns, which had no overhead protection except for magazines and generators. The 12-inch (305 mm) mortars of Battery Geary and Battery Way fared better until near the end; their battery arrangement did not require electric power for ammunition hoists. However, Battery Way at least had been out of service for years; only three mortars were restored to service and these not until 28 April, and by 5 May two of these were out of action. There was also a shortage of high explosive shells, and adapting the armor piercing shells for instantaneous detonation was time-consuming at only 25 shells per day. On 2 May a 240 mm shell penetrated one of Battery Geary's magazines; the resulting explosion put the entire battery out of action, blowing one mortar 150 yards (140 m) from the battery and embedding another mortar entirely inside another magazine.^[49] Among the harbor forts, only Fort Drum's turrets proved impregnable to attack; they remained in action until the surrender despite damage to other parts of the fort.^[50]

On the night of 4 May a submarine returning to Australia from patrol evacuated 25 persons. Among the passengers were Colonel Constant Irwin, who carried a complete roster of all Army, Navy, and Marine personnel still alive; Col. Royal G. Jenks, a finance officer, with financial accounts; Col. Milton A. Hill, the inspector general, 3 other Army and 6 Navy officers, and about 13 nurses. Included in the cargo sent from Corregidor were several bags of mail, the last to go out of the Philippines, and "many USAFFE and USFIP records and orders".^[51]

The bombardment increased in intensity through 5 May, and the Japanese landed that night. Their initial landing was near the east end of the island, north of Kindley Field, the airstrip. This was somewhat east of their objective, which was between Infantry Point and Cavalry Point, due to a miscalculation of the current.^[52] The 4th Marine Regiment coordinated the ground forces, which included many soldiers and sailors from support units untrained in ground combat, many of them escapees from Bataan. Several coast artillery and antiaircraft batteries were abandoned to free their crews as ground forces.^[53] Of 229 officers and 3,770 enlisted men attached to the regiment, only around 1,500 were US Marines. The Japanese landed on the night of 5 May about 2300, with 75 mm and 37 mm guns deployed for beach defense reportedly causing them heavy casualties. At least three of the 155 mm guns were also still in action. However, by 0130 the Japanese captured Battery Denver, turning back three Allied counterattacks by 0400. At dawn, around 0440, more invasion barges were spotted and fire support from Fort Drum's 14-inch (356 mm) guns was requested. Although smoke obscured the barges, Fort Drum was directed to fire "anywhere between you and Cabcaben" (in Bataan), and over 100 rounds were fired on the invasion route.^[53] By 1000 the Japanese were firmly lodged on the island. With 600-800 Allied troops killed and over 1,000 wounded, no reserves were left. No one was available to evacuate the wounded, and most of those who attempted to walk to the Malinta Tunnel were either further wounded or killed. General Wainwright felt certain that further Japanese troops would land in the night and seize the Malinta Tunnel, where they might massacre the wounded and noncombatants. He decided to sacrifice one day of freedom to save several thousand lives. After giving orders to his forces to destroy their weapons to prevent their use by the enemy, he surrendered.^[54]

Although all the harbor forts were included in the surrender, General Wainwright made every effort to avoid surrendering the troops in the southern Philippines. He sent an order placing them directly under MacArthur just before surrendering Corregidor. However, the Japanese insisted that all US and Filipino forces in the islands be included, and stated they would not cease offensive operations until that took place. Wainwright believed this meant they might start executing the 10,000 or so prisoners from Corregidor and the other forts, so he ordered the surrender of all forces. The units in the south were in much better positions for both supplies and continued resistance than those at Bataan or Corregidor were, and their commanders believed Wainwright's surrender orders were made under duress. It was not until 9 June that the Japanese accepted that all of the islands had surrendered. Some units never did surrender, and became nuclei for guerrilla operations that continued until the Japanese were mostly killed or captured in early 1945, following MacArthur's return to the Philippines in force in October 1944.^[32][55]

The conquest of the Philippines by Japan is often considered the worst military defeat in United States history.^[56] About 23,000 American military personnel were killed or captured, while Filipino soldiers killed or captured totaled around 100,000.^[57]

The Philippines, Burma, and the Dutch East Indies were the last major territories the Japanese invaded in World War II, all captured in early 1942. As Corregidor surrendered, the Battle of the Coral Sea was in progress, turning back a Japanese attempt to seize Port Moresby, New Guinea by sea. By the final surrender on 9 June, the Battle of Midway was over, blunting Japan's naval strength with the loss of four large aircraft carriers and hundreds of skilled pilots. Both of these victories were costly to the US Navy as well, with two aircraft carriers lost, but the United States could replace their ships and train more pilots, and Japan, for the most part, could not do so adequately.

Flag re-hoisted during bombardment

On 16 April 1942, during an intense Japanese artillery bombardment, the 100-foot flagpole's halyard was severed and the flag began to come down. Four men of Battery B, 60th Coast Artillery (AA), including Captain Arthur E. Huff, left shelter to catch the flag before it reached the ground. They repaired the halyard, re-raised the flag, and returned to shelter. Each of them received the Silver Star.^[69]

Pieces of flag preserved

Just before surrendering on 6 May 1942, Colonel Paul Bunker, commander of the 59th Coast Artillery and the Seaward Defenses, followed General Wainwright's orders to haul down and burn Corregidor's flag, to avoid turning it over to the Japanese, and run up the white flag. He kept a piece of the American flag that he sewed into his clothing.^[70]

On 10 June 1942, in the Bilibid Prison hospital, Manila, Bunker sent for Colonel Delbert Ausmus, cut the flag remnant into two pieces and gave one of the pieces to Ausmus. He told Colonel Ausmus he did not expect to survive the prison camp and that it was Ausmus' duty to take his piece of the flag to the Secretary of War.^[71] Ausmus concealed the remnant in his shirt cuff, and shortly after the war ended, Ausmus delivered it to Secretary Patterson.^[71] In November 1945, Ausmus described the circumstances under which he received the remnant from Bunker:

"He was taken to Bilibid prison in Manila and came down with pneumonia. While he was in the hospital Col. Paul D. Bunker of Taunton, Mass., was brought in suffering from seriously infected blisters on his feet and blood poisoning in one leg. On June 10, Bunker watching carefully 'to see that there were no Japs near,' swore him to secrecy, Ausmus continued, and 'said he wanted to turn something over to me to deliver to the Secretary of War.' From beneath a false patch set into the left pocket of his shirt Bunker took a bit of red cloth. Solemnly he gave Ausmus part of it and put the rest back."^[72]

On 16 March 1943, Colonel Bunker died in a Japanese prison camp in Karenko, Taiwan. While giving one piece of the flag to Ausmus, he held onto another piece until the time of his death. General Wainwright later recalled the circumstances of Bunker's death in the prison camp, still holding onto the remnant: "He must have suffered ... constant pain of hunger ... I sat with him for a part of the last two hours of his life ... [He was] cremated in the rags in which he had carefully sewn a bit of the American flag he had pulled down in Corregidor."^[73]

Ausmus did deliver it to the Secretary of War who unveiled it during a speech on the event of Flag Day in June 1946.^[71] The remnant of the U.S. flag from Corregidor saved by Bunker and Ausmus is on display in the West Point museum.^[74]

Flag raised again on Corregidor

On 2 March 1945, with Corregidor secured, a flag-raising ceremony with General MacArthur present was held at Topside. With a new flag raised, Colonel Jones of the 503rd Parachute Infantry saluted the general and said simply, "Sir, I present to you Fortress Corregidor."^[75]