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The attack on Pearl Harbor was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, Hawaii, on the morning of December 7, 1941 (December 8 in Japan). The attack led to the United States' entry into World War II.

The attack was intended as a preventive action in order to keep the U.S. Pacific Fleet from interfering with military actions the Empire of Japan was planning in Southeast Asia against overseas territories of the United Kingdom, the Netherlands, and the United States. There were simultaneous Japanese attacks on the U.S.-held Philippines and on the British Empire in Malaya, Singapore, and Hong Kong. The attack came as a profound shock to the American people and led directly to the American entry into World War II in both the Pacific and European theaters. The following day, December 8, the United States declared war on Japan. Domestic support for non-interventionism, which had been strong, disappeared. Clandestine support of Britain (e.g., the Neutrality Patrol) was replaced by active alliance. Subsequent operations by the U.S. prompted Germany and Italy to declare war on the U.S. on December 11, which was reciprocated by the U.S. the same day.

Years later several writers alleged that parties high in the U.S. and British governments knew of the attack in advance and may have let it happen (or even encouraged it) with the aim of bringing America into war. However, this advance-knowledge conspiracy theory is rejected by mainstream historians.

There were numerous historical precedents for unannounced military action by Japan. However, the lack of any formal warning, particularly while negotiations were still apparently ongoing, led President Franklin D. Roosevelt to proclaim December 7, 1941, "a date which will live in infamy". Because the attack happened without a declaration of war and without explicit warning, the attack on Pearl Harbor was judged by the Tokyo Trials to be a war crime.

Bombing of Pearl Harbor

Sixteen U.S. Army Air Forces B-25B Mitchell medium bombers were launched without fighter escort from the U.S. Navy's aircraft carrier USS Hornet deep in the Western Pacific Ocean, each with a crew of five men. The plan called for them to bomb military targets in Japan, and to continue westward to land in China—landing a medium bomber on Hornet was impossible. Fifteen of the aircraft reached China, and the other one landed in the Soviet Union. All but three of the crew survived, but all the aircraft were lost. Eight crewmen were captured by the Japanese Army in China; three of these were executed. The B-25 that landed in the Soviet Union at Vladivostok was confiscated and its crew interned for more than a year. Fourteen crews, except for one crewman, returned either to the United States or to American forces.

After the raid, the Japanese Imperial Army conducted a massive sweep through the eastern coastal provinces of China, in an operation now known as the Zhejiang-Jiangxi Campaign, searching for the surviving American airmen and applying retribution on the Chinese who aided them, in an effort to prevent this part of China from being used again for an attack on Japan. An estimated 250,000 Chinese civilians were killed by the Japanese during this operation.

The raid caused negligible material damage to Japan, but it succeeded in its goal of raising American morale and casting doubt in Japan on the ability of its military leaders to defend their home islands. It also caused Japan to withdraw its powerful aircraft carrier force from the Indian Ocean to defend their Home Islands, and the raid contributed to Admiral Isoroku Yamamoto's decision to attack Midway Island in the Central Pacific—an attack that turned into a decisive strategic defeat of the Imperial Japanese Navy (IJN) by the U.S. Navy in the Battle of Midway. Doolittle, who initially believed that loss of all his aircraft would lead to his being court-martialled, received the Medal of Honor and was promoted two steps to Brigadier General.

Doolittle's Raid

The invasion of the Philippines started on December 8, 1941, ten hours after the attack on Pearl Harbor. As at Pearl Harbor, American aircraft were severely damaged in the initial Japanese attack. Lacking air cover, the American Asiatic Fleet in the Philippines withdrew to Java on December 12, 1941. General Douglas MacArthur escaped Corregidor on the night of March 11, 1942 for Australia, 4,000 km away. The 76,000 starving and sick American and Filipino defenders on Bataan surrendered on April 9, 1942, and were forced to endure the infamous Bataan Death March on which 7,000–10,000 died or were murdered. The 13,000 survivors on Corregidor surrendered on May 6.

Japan occupied the Philippines for over three years, until the surrender of Japan. A highly effective guerilla campaign by Philippine resistance forces controlled sixty percent of the islands, mostly jungle and mountain areas. MacArthur supplied them by submarine, and sent reinforcements and officers. Filipinos remained loyal to the United States, partly because of the American guarantee of independence, and also because the Japanese had pressed large numbers of Filipinos into work details and even put young Filipino women into brothels.

General MacArthur kept his promise to return to the Philippines on October 20, 1944. The landings on the island of Leyte were accomplished by a force of 700 vessels and 174,000 men. Through December 1944, the islands of Leyte and Mindoro were cleared of Japanese soldiers. During the campaign, the Imperial Japanese Army conducted a suicidal defense of the islands. Cities such as Manila were reduced to rubble. Between 500,000 and 1,000,000 Filipinos died during the occupation.

Japanese occupation of the Philippines

Began on April 9, 1942, was the forcible transfer by the Imperial Japanese Army of 60,000–80,000 Filipino and American prisoners of war after the three-month Battle of Bataan in the Philippines during World War II. All told, approximately 2,500–10,000 Filipino and 100–650 American prisoners of war died before they could reach their destination at Camp O'Donnell. The reported death tolls vary, especially amongst Filipino POWs, because historians cannot determine how many prisoners blended in with the civilian population and escaped. The march went from Mariveles, Bataan, to San Fernando, Pampanga. From San Fernando, survivors were loaded to a box train and were brought to Camp O'Donnell in Capas, Tarlac.

The 60 mi (97 km) march was characterized by occasional severe physical abuse and resulted in some fatalities inflicted upon prisoners and civilians alike by the Japanese Army. It was later judged by an Allied military commission to be a Japanese war crime.

Bataan Death March

Japanese Occupation of China

The war was the result of a decades-long Japanese imperialist policy aiming to dominate China politically and militarily and to secure its vast raw material reserves and other economic resources, particularly food and labour. Before 1937, China and Japan fought in small, localized engagements, so-called "incidents". In 1931, the Japanese invasion of Manchuria by Japan's Kwantung Army followed the Mukden Incident. The last of these incidents was the Marco Polo Bridge Incident of 1937, marking the beginning of total war between the two countries.

Initially the Japanese scored major victories in Shanghai after heavy fighting, and by the end of 1937 captured the Chinese capital of Nanking. After failing to stop the Japanese in Wuhan, the Chinese central government was relocated to Chongqing in the Chinese interior. By 1939 the war had reached stalemate after Chinese victories in Changsha and Guangxi. The Japanese were also unable to defeat the Chinese communist forces in Shaanxi, which performed harassment and sabotage operations against the Japanese using guerrilla warfare tactics. On December 7, 1941, the Japanese attacked Pearl Harbor, and the following day (December 8, 1941) the United States declared war on Japan. The United States began to aid China via airlift matériel over the Himalayas after the Allied defeat in Burma that closed the Burma Road

The Battle Of Midway

the Pacific Theater of Operations was one of the most important naval battles of World War II. Between 4 and 7 June 1942, only six months after Japan's attack on Pearl Harbor, and one month after the Battle of the Coral Sea, the United States Navy (USN), under Admirals Chester W. Nimitz, Frank Jack Fletcher, and Raymond A. Spruance decisively defeated an attack by the Imperial Japanese Navy (IJN), under Admirals Isoroku Yamamoto, Chuichi Nagumo, and Nobutake Kondo on Midway Atoll, inflicting irreparable damage on the Japanese fleet. Military historian John Keegan called it "the most stunning and decisive blow in the history of naval warfare." It was Japan's first naval defeat since the Battle of Shimonoseki Straits in 1863.

The Japanese operation, like the earlier attack on Pearl Harbor, sought to eliminate the United States as a strategic power in the Pacific, thereby giving Japan a free hand in establishing its Greater East Asia Co-Prosperity Sphere. The Japanese hoped that another demoralizing defeat would force the U.S. to capitulate in the Pacific War and thus ensure Japanese dominance in the Pacific.

The Japanese plan was to lure the United States' aircraft carriers into a trap. The Japanese also intended to occupy Midway as part of an overall plan to extend their defensive perimeter in response to the Doolittle air raid on Tokyo. This operation was also considered preparatory for further attacks against Fiji, Samoa, and Hawaii itself.

The plan was handicapped by faulty Japanese assumptions of the American reaction and poor initial dispositions. Most significantly, American codebreakers were able to determine the date and location of the attack, enabling the forewarned U.S. Navy to set up an ambush of its own. Four Japanese aircraft carriers—Akagi, Kaga, Soryu and Hiryu, all part of the six-carrier force that had attacked Pearl Harbor six months earlier—and a heavy cruiser were sunk at a cost of one American aircraft carrier and a destroyer. After Midway and the exhausting attrition of the Solomon Islands campaign, Japan's shipbuilding and pilot training programs were unable to keep pace in replacing their losses, while the U.S. steadily increased its output in both areas.

Battle of Guadalcanal

Took place from 12–15 November 1942, and was the decisive engagement in a series of naval battles between Allied (primarily United States) and Imperial Japanese forces during the months-long Guadalcanal Campaign in the Solomon Islands during World War II. The action consisted of combined air and sea engagements over four days, most near Guadalcanal and all related to a Japanese effort to reinforce land forces on the island. The only two U.S. Navy admirals to be killed in a surface engagement in the war were lost in this battle.

Allied forces, primarily from the U.S., had landed on Guadalcanal on 7 August 1942 and seized an airfield, later called Henderson Field, that was under construction by the Japanese military. Several subsequent attempts by the Imperial Japanese Army and Navy, using reinforcements delivered to Guadalcanal by ship, to recapture the airfield failed. In early November 1942, the Japanese organized a transport convoy to take 7,000 infantry troops and their equipment to Guadalcanal to attempt once again to retake the airfield. Several Japanese warship forces were assigned to bombard Henderson Field with the goal of destroying Allied aircraft that posed a threat to the convoy. Learning of the Japanese reinforcement effort, U.S. forces launched aircraft and warship attacks to defend Henderson Field and prevent the Japanese ground troops from reaching Guadalcanal.

In the resulting battle, both sides lost numerous warships in two extremely destructive surface engagements at night. Nevertheless, the U.S. succeeded in turning back attempts by the Japanese to bombard Henderson Field with battleships. Allied aircraft also sank most of the Japanese troop transports and prevented the majority of the Japanese troops and equipment from reaching Guadalcanal. Thus, the battle turned back Japan's last major attempt to dislodge Allied forces from Guadalcanal and nearby Tulagi, resulting in a strategic victory for the U.S. and its allies and deciding the ultimate outcome of the Guadalcanal campaign in their favor.

Battle of Saipan

The Battle of Saipan was a battle of the Pacific campaign of World War II, fought on the island of Saipan in the Mariana Islands from 15 June–9 July 1944. The Allied invasion fleet embarking the expeditionary forces left Pearl Harbor on 5 June 1944, the day before Operation Overlord in Europe was launched. The U.S. 2nd Marine Division, 4th Marine Division, and 27th Infantry Division, commanded by Lieutenant General Holland Smith, defeated the 43rd Division of the Imperial Japanese Army, commanded by Lieutenant General Yoshitsugu Saito.

Saipan also saw a change in the way Japanese war reporting was presented on the home front. Initially, as the battle started, Japanese accounts concentrated on the fighting spirit of the IJA and the heavy casualties it was inflicting on American forces. However, any reader familiar with Saipan's geography would have known from the chronology of engagements that the US Marines were relentlessly advancing northwards. No further mention of Saipan was made following the final battle on 7 July, which was not initially reported to the public. However, after Tōjō's resignation on 18 July, an accurate, almost day-by-day, account of the defeat on Saipan was published jointly by the Army and Navy. It mentioned the near total loss of all Japanese soldiers and civilians on the island and the use of "human bullets". The reports had a devastating effect on Japanese opinion; mass suicides were now seen as defeat, not evidence of an "Imperial Way". This was the first time Japanese forces had accurately been depicted in a battle since Midway, which had been proclaimed a victory.

Battle of Iwo Jim

The Imperial Japanese Army positions on the island were heavily fortified, with a dense network of bunkers, hidden artillery positions, and 18 km (11 mi) of underground tunnels. The Americans on the ground were supported by extensive naval artillery and complete air supremacy over Iwo Jima from the beginning of the battle by U.S. Navy and Marine Corps aviators.

Iwo Jima was also the only battle by the U.S. Marine Corps in which the American casualties exceeded the Japanese, although Japanese combat deaths numbered three times as many American deaths. Of the 22,000 Japanese soldiers on Iwo Jima at the beginning of the battle, only 216 were taken prisoner, some of whom were captured because they had been knocked unconscious or otherwise disabled. The majority of the remainder were killed in action, although it has been estimated that as many as 3,000 continued to resist within the various cave systems for many days afterwards, eventually succumbing to their injuries or surrendering weeks later.

Despite the bloody fighting and severe casualties on both sides, the Japanese defeat was assured from the start. Overwhelming American superiority in arms and numbers as well as complete control of air power — coupled with the impossibility of Japanese retreat or reinforcement — permitted no plausible circumstance in which the Americans could have lost the battle.

The battle was immortalized by Joe Rosenthal's photograph of the raising of the U.S. flag on top of the 166 m (545 ft) Mount Suribachi by five U.S. Marines and one U.S. Navy battlefield Hospital Corpsman. The photograph records the second flag-raising on the mountain, both of which took place on the fifth day of the 35-day battle. Rosenthal's photograph promptly became an indelible icon — of that battle, of that war in the Pacific, and of the Marine Corps itself — and has been widely reproduced.

The Atomic Bombs

In August 1945, during the final stage of the Second World War, the United States dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki. The two bombings, which killed at least 129,000 people, remain the only use of nuclear weapons for warfare in human history.

As the Second World War entered its sixth and final year, the Allies had begun to prepare for, what was anticipated to be, a very costly invasion of the Japanese mainland. This was preceded by an immensely destructive firebombing campaign that obliterated many Japanese cities. The war in Europe had concluded when Nazi Germany signed its instrument of surrender on May 8, 1945, but with the Japanese refusal to accept the Allies' demands for unconditional surrender, the Pacific War dragged on. Together with the United Kingdom and China, the United States calls for the unconditional surrender of the Japanese armed forces in the Potsdam Declaration on July 26, 1945 was buttressed with the threat of "prompt and utter destruction".

By August 1945, the Allied Manhattan Project had successfully detonated an atomic device in the New Mexico desert and subsequently produced atomic weapons based on two alternate designs. The 509th Composite Group of the U.S. Army Air Forces was equipped with a Silverplate Boeing B-29 Superfortress that could deliver them from Tinian in the Mariana Islands. A uranium gun-type atomic bomb (Little Boy) was dropped on Hiroshima on August 6, 1945, followed by a plutonium implosion-type bomb (Fat Man) on the city of Nagasaki on August 9. Within the first two to four months of the bombings, the acute effects of the atomic bombings killed 90,000–166,000 people in Hiroshima and 39,000–80,000 in Nagasaki; roughly half of the deaths in each city occurred on the first day. During the following months, large numbers died from the effect of burns, radiation sickness, and other injuries, compounded by illness and malnutrition. In both cities, most of the dead were civilians, although Hiroshima had a sizable military garrison.

On August 15, just days after the bombing of Nagasaki and the Soviet Union's declaration of war, Japan announced its surrender to the Allies. On September 2, it signed the instrument of surrender, effectively ending World War II. The bombings' role in Japan's surrender and their ethical justification are still debated.

The Surrender of Japan

The surrender of the Empire of Japan on September 2, 1945, brought the hostilities of World War II to a close. By the end of July 1945, the Imperial Japanese Navy was incapable of conducting major operations and an Allied invasion of Japan was imminent. While publicly stating their intent to fight on to the bitter end, Japan's leaders, (the Supreme Council for the Direction of the War, also known as the "Big Six"), were privately making entreaties to the neutral Soviet Union to mediate peace on terms more favorable to the Japanese. Meanwhile, the Soviets were preparing to attack Japanese forces in Manchuria and Korea in fulfillment of promises they had secretly made to the United States and the United Kingdom at the Tehran and Yalta Conferences.

On August 6, 1945, the United States dropped an atomic bomb on the Japanese city of Hiroshima. Late in the evening of August 8, 1945, in accordance with the Yalta agreements, but in violation of the Soviet–Japanese Neutrality Pact, the Soviet Union declared war on Japan, and soon after midnight on August 9, 1945, the Soviet Union invaded the Imperial Japanese puppet state of Manchukuo. Later that same day, the United States dropped a second atomic bomb, this time on the Japanese city of Nagasaki. The combined shock of these events caused Emperor Hirohito to intervene and order the Supreme Council for the Direction of the War to accept the terms the Allies had set down in the Potsdam Declaration for ending the war. After several more days of behind-the-scenes negotiations and a failed coup d'état, Emperor Hirohito gave a recorded radio address across the Empire on August 15. In the radio address, called the Gyokuon-hōsō ("Jewel Voice Broadcast"), he announced the surrender of Japan to the Allies.

On August 28, the occupation of Japan by the Supreme Commander for the Allied Powers began. The surrender ceremony was held on September 2, aboard the United States Navy battleship USS Missouri (BB-63), at which officials from the Japanese government signed the Japanese Instrument of Surrender, thereby ending the hostilities. Allied civilians and military personnel alike celebrated V-J Day, the end of the war; however, some isolated soldiers and personnel from Imperial Japan's far-flung forces throughout Asia and the Pacific islands refused to surrender for months and years afterwards, some even refusing into the 1970s. The role of the atomic bombings in Japan's surrender, and the ethics of the two attacks, is still debated. The state of war between Japan and the Allies formally ended when the Treaty of San Francisco came into force on April 28, 1952. Four more years passed before Japan and the Soviet Union signed the Soviet–Japanese Joint Declaration of 1956, which formally brought an end to their state of war.