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The Information War in the Pacific, 1945

AFIO’s Weekly Intelligence Notes of 6 August 2007.

The Information War in the Pacific, 1945

Original source was a publication of the CIA’s Center for the Study of Intelligence; “The Information War in the Pacific, 1945: Paths to Peace,” by Josette H. Williams, dtd 14 April 2007.

In August 1945, the world went into a state of shock at the sheer devastating power of nuclear weapons. Over fifty years later, that shock still eclipses the fascinating story of how the Japanese nation actually came to surrender.


Many Americans believe that the surrender immediately followed the use of the atomic bomb. Worse, young Japanese seem to consider the bombing of Hiroshima and Nagasaki to be isolated incidents without cause. Ignorance of the history of August 1945 may turn out to be one of the lamentable legacies of World War II. There is no question that the Allies’ superior military power and determined spirit defeated Japan. But it was the Allies’ communication network that provided war information directly to the Japanese people and an unprecedented response by the Emperor that pushed Japan to accept this defeat.

The Office of War Information. The Office of War Information was responsible for using information warfare to promote distrust of Japanese military leaders, lower Japanese military and civilian morale, and encourage surrender. Information was disseminated by radio and leaflet both to the Japanese mainland and to enemy forces hidden on Allied-occupied Pacific islands. OWI was manned by civilians and supported by military liaison personnel. The communication network was complex. OWI monitored Radio Tokyo broadcasts through its offices in San Francisco, where they were summarized and relayed to Washington. Response and new copy were composed and coded in Washington, then relayed through Honolulu to OWI’s printing presses and radio station on Saipan. Saipan’s location, 1,200 miles southeast of Tokyo, put Japan and China within range of Allied bombers, provided a staging area for invasion of the Japanese homeland, and allowed direct transmission of radio broadcasts to the Japanese people. From Saipan, OWI bombarded Japan with radio messages through its 50,000-watt standard-wave station, Radio KSAI. The station also picked up 100,000-watt shortwave transmissions from the OWI station in Honolulu and relayed them to Japan. Japanese language broadcasts consisted of news on the status of the war, bombing warnings, and messages from Japanese prisoners of war on Saipan urging surrender. KSAI radio transmissions served many purposes: to Japan’s civilian government, they were a vital source of news, received at a time when the fanaticism of the Japanese militarists denied civilian leaders access to information about the status of the war; to hidden Japanese soldiers on occupied Pacific islands, they tempted surrender by promising fair treatment as prisoners of war; and to Allied flight crews, the around-the-clock OWI radio transmissions beamed home the B-29s, saving planes and lives.

At the same time, newspapers and leaflets in the Japanese language were printed on Saipan. From there, Air Force B-29s flying at 20,000 feet dropped 500-pound M-16 fire bomb containers converted into leaflet casings. These opened at 4,000 feet to deploy millions of leaflets, effectively covering a whole Japanese city with information. In just the last three months of formal psychological warfare, OWI produced and deployed over 63 million leaflets informing the Japanese people of the true status of the war and providing advance warning to35 cities targeted for destruction. Outside Japan, leaflets promoting the surrender of individual Japanese soldiers and civilians were dropped near cave and tunnel hideouts on islands that had been captured by the Allies.

The job of the US Office of War information was to cut through the confusion in Japan and its occupied territories, and to convince the Emperor, the politicians, and the civilians that victory was already in the hands of the Allies.

On 26 July 1945, the heads of state of the United States, Great Britain, and the Soviet Union, meeting in Potsdam, Germany, agreed to give Japan an opportunity to end the war. Their terms called for the disarmament and abolition of the Japanese military; elimination of military influence in political forums; Allied occupation of Japan; liberation of Pacific territories gained by Japan since 1914; swift justice for war criminals; maintenance of non-military industries; establishment of freedom of speech, religion and thought; and introduction of respect for fundamental human rights. The final section demanded that the government of Japan “proclaim now the unconditional surrender of all Japanese armed forces.” The alternative for Japan was “prompt and utter destruction.” Immediately after the Potsdam Proclamation, OWI’s station KSAI began broadcasting the surrender terms to the Japanese nation at regular intervals. OWI also printed the full text of the offer in the Japanese language and dropped over 3 million leaflets by B-29 aircraft. Thus Japanese officials learned of the Potsdam conditions a day ahead of the official communication sent through diplomatic channels. Japan’s Cabinet and the Supreme Council for the Direction of the War were immediately called into joint session. They met almost continually from 26 July through 14 August. Arguments over whether, when, and under what conditions Japan should surrender continued right through the bombing of Hiroshima and Nagasaki. On 27 July, after a routine meeting not attended by Japan’s civilian Foreign Minister, the militarists released notification to the world’s media that Japan rejected the Potsdam offer. By noon on 28 July, OWI’s presses on Saipan were rolling with notices warning civilians to evacuate 35 Japanese cities scheduled to be bombed within the next few days. About 1 million leaflets fell on the targeted cities whose names appeared in Japanese writing under a picture of five airborne B-29s releasing bombs. Given the extent of the effort, it is extraordinary that many Americans are not aware that Japanese cities were warned prior to being bombed.

At 8:15 a.m. on 6 August, the “Enola Gay” destroyed Hiroshima with a single atomic bomb. Back on Saipan, the OWI presses were turning out leaflets that revealed the special nature of Hiroshima’s destruction and predicted similar fates for more Japanese cities in the absence of immediate acceptance of the terms of the Potsdam agreement. By 9 August, more than 5 million leaflets about the atom bomb had been released over major Japanese cities. The OWI radio station beamed a similar message to Japan every 15 minutes.

Japanese officials dispatched scientists and military personnel to Hiroshima to assess damages from the atomic bomb, but they remained paralyzed by disagreement over whether to surrender. The Supreme Council for the Direction of the War, composed of four military and two civilian members, was deadlocked, unable to present the Cabinet and the Emperor with its customary unanimous decision. Military representatives maintained that any surrender agreement had to guarantee the Emperor’s continued power as sovereign ruler, prevent occupation of major cities such as Tokyo, and place responsibility for disarmament and dealing with war criminals in Japan’s own hands. The civilian trio opposing them viewed the Potsdam agreement as an ultimatum. In their view, the only negotiable ambiguity was the official position of the Emperor – the Potsdam agreement had applied the term “unconditional surrender” exclusively to the enemy’s armed forces. It took an unprecedented action by the Emperor, and the extraordinary effort of OWI to publicize his action, to break the Japanese military-civilian deadlock.

Half an hour after the 9 August Cabinet meeting ended, Premier Suzuki Kantaro and Foreign Minister Tg Shigenori called members of the Cabinet and the Supreme Council, and Baron Kiichiro Hiranuma, President of Japan’s Privy Council, into an Imperial Conference. For several hours in a hot, airless bomb shelter, the Emperor listened to the opposing arguments. His political role usually consisted of passively endorsing Cabinet decisions. But at 2:00 a.m. on the morning of 10 August, in a deeply moving speech, Japan’s Emperor Hirohito called upon the power of his moral and spiritual leadership and directed that Japan should accept the terms of the Potsdam agreement, but with the stipulation that the Emperor remain the sovereign ruler of the country. By 7:00 a.m., the Foreign Minister had dispatched an announcement of the decision to the United States and China through Japan’s Minister Shunichi Kase in Switzerland, and to Great Britain and the USSR through Minister Suemasa Okamoto in Sweden.

Washington hotly debated Japan’s request for modification of the Potsdam accord. One side was convinced that acceding to Japan’s proviso would inspire prolonged fighting; the other side held that assuring the Emperor’s continued status as head of state would strengthen post-war reformation. In the end, Secretary of State Byrnes prevailed and prepared the Allied nations’ reply, stipulating that the Emperor could remain as a sovereign ruler, but that “from the moment of surrender, the authority of the Emperor and the Japanese Government to rule the state shall be subject to the Supreme Commander of the Allied powers.” With the concurrence of the United Kingdom, China, Australia and, ultimately, the USSR, the reply was forwarded to Japan through Switzerland.

OWI now played its most dramatic role. Japanese prisoners helped turn out leaflets and newspapers on OWI’s presses on Saipan. Technically, Japan had not yet surrendered. The war was not yet over. President Truman had ordered the continuation of Allied bombing runs over Japanese military installations. The people of Japan knew nothing of their government’s plan to surrender. Radio Tokyo still exhorted all Japanese to prepare defenses against an enemy invasion. In a race to save the lives of soldiers still fighting, the Allies’ acceptance of Japan’s modification of the Potsdam surrender terms was radioed to OWI in Honolulu and Saipan at the same time that it was forwarded to Switzerland. The US War Department sent an urgent dispatch ordering OWI to inform the Japanese people directly, by leaflet and radio, that their government had offered to surrender and that the Allies had accepted the offer. The order, which originated from the White House, threw OWI personnel into high gear. The text for the message was prepared in Washington and dictated by telephone to Honolulu, where it was transcribed, translated into Japanese, lettered, and transmitted to Saipan by “radiophoto” within two hours. The 17 members of the OWI staff on Saipan were challenged to a previously unmatched degree. By mid-night on 11 August, less than 48 hours after Japan’s message was received in Washington, three-quarters of a million leaflets giving notification of the surrender offer had been printed on OWI’s three Webendorfer highspeed presses running continually. By the next afternoon, production of OWI leaflet #2117 totaled well over 5 million copies. OWI did not have to work alone in this important effort. Saipan’s naval base designated two 15-member Navy crews to pack the leaflets into bomb casings for delivery. All bombing of Japan ceased while the Air Force loaded the leaflets onto the B-29s of its 73rd Wing. Even Japanese prisoners of war on Saipan volunteered.

On 12 August, aircraft runs departed Saipan delivering to the people of Japan the news of their government’s surrender offer. The 4″ x 5″ leaflets rained down by the millions, telling the Japanese people: These American planes are not dropping bombs on you today. American planes are dropping these leaflets instead because the Japanese Government has offered to surrender, and every Japanese has a right to know the terms of that offer and the reply made to it by the United States Government on behalf of itself, the British, the Chinese, and the Russians. Your government now has a chance to end the war immediately. You will see how the war can be ended by reading the two following official statements. Two paragraphs then gave the Japanese surrender offer verbatim and the Byrnes response indicating the Allies’ willingness to accept that offer. OWI repeated the same message continuously over station KSAI. The significance of this information barrage cannot be overstated. For the first time the Japanese people became aware that their government was trying to surrender. And it was the first that Japanese officials knew of the Allies’ acceptance of their surrender offer, because the OWI notification preceded, by about 72 hours, the receipt of the official diplomatic reply sent through Switzerland.

Copies of the leaflet that fell on the palace grounds were immediately taken to the Emperor by Marquis Kichi Kido, Lord Keeper of the Privy Seal. The Emperor realized that Japanese civilians now knew of the surrender attempt and, more significantly, so did ordinary Japanese soldiers, sailors, and airmen. Fearing a military coup to ensure continuation of the war, the Emperor decided to take additional action to bring the conflict to an end. On 13 August, when the Cabinet was called into immediate session, members Anami Korechika, Umezo Yoshijir, and Toyoda Soemu unexpectedly dissented anew, saying that an item in the original Potsdam proposal stipulating that postwar Japan would ultimately be governed by the will of the people was against Japanese tradition and therefore compliance was impossible. This reversal precipitated another Imperial Conference at which the Emperor stopped all argument by forcefully declaring that Japan would accept the Potsdam conditions as modified in the 11 August message from US Secretary of State Byrnes on behalf of the Allied nations. In an action without precedent, the Emperor decided to issue an Imperial Rescript announcing the capitulation, to be delivered both to the Allies through diplomatic channels and to his subjects in his own voice via radio broadcast. The enormity of this decision must be understood in context: the Emperor was considered a deity – no one was allowed to look upon him from above, few citizens had seen him at all, and the Japanese people had never before heard his voice. Hirohito well understood the powerful effect his broadcast would have. On 14 August, the Emperor made two recordings of the Rescript for broadcast the next day. Aware that such a powerful communication would doom efforts to continue the war, the military sent soldiers from a Tokyo garrison to attack the Imperial Palace at night, imprison the Emperor, and seize the recordings. They failed to turn up the recordings, however, which had been secured at the radio station. Later that night, War Minister Anami Korechika, having failed to promote his views and control his soldiers, committed suicide, the first of many such actions in the days that followed.

At noon on 15 August, a stunned population listened to Emperor Hirohito’s high, shaking, unfamiliar voice announcing the final surrender of the Japanese nation. On Saipan, OWI staff members had little time to savor the moment. They were already hard at work producing leaflets of instruction for the surrendering Japanese on the homeland islands and subsequently in Manchuria, China, New Guinea, and the Philippines. On 17 August 1945, Secretary of State Byrnes thanked the OWI staff in Honolulu and Saipan, saying, “I have been requested by Secretary Byrnes to send appreciation to everyone concerned for the magnificent work done in lettering, translating, printing, sending, and distributing the important leaflet directly before the surrender of Japan. It is the belief of Secretary Byrnes as well as we in this office that the factor which helped to bring about the final surrender was this leaflet. We would appreciate your passing this along to everyone concerned including Hubert [Chief of the Forward Area], Air Force personnel, Psychological Warfare and all those in the OWI who are well deserving of congratulations for the superb job.” On 2 September, formal instruments of surrender were signed by Japanese officials on behalf of the Emperor and by Allied officials on behalf of the governments of the United States, the Republic of China, the United Kingdom, the Union of Soviet Socialist Republics, the Commonwealth of Australia, the Dominion of New Zealand, the Dominion of Canada, the Provisional Government of the French Republic, and the Kingdom of the Netherlands.

Although OWI continued to handle its national affairs through its headquarters in Washington until 12 March 1946, its overseas operations began to wind down after Japan’s surrender. On 7 September 1945, oversight of the forward area on Saipan was transferred to the United States Information Service; OWI’s Honolulu office closed on 31 October 1945. Chief of the Forward Area, Richard Hubert, returning to Washington, reflected the sentiment of many on his staff: It is an honor and privilege to have served with the Office of War Information, which agency deserves more credit than public opinion may ever realize. Operating abroad in secrecy, it is undoubtedly so that the Axis know more about the OWI operations than our own citizens.

[Williams/CIA/14April2007]

Original source was a publication of the CIA’s Center for the Study of Intelligence; “The Information War in the Pacific, 1945: Paths to Peace,” by Josette H. Williams, dtd 14 April 2007. The unabridged article with excellent illustrations can be found at:
https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/csi-studies/studies/vol46no3/article07.html
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