tl431做恒流源:Information about the city of Hiroshima in World War II

History

The city was heavily damaged in World War II by the nuclear weapon Little Boy, which was the second such device to be detonated, and the first ever used in military action. The US government has claimed that the American atomic attack on Hiroshima and Nagasaki was the major factor leading to the surrender of the Japanese Government several days later--the claim is highly controversial.

During World War II, Hiroshima was a city of considerable military importance. It contained the 2nd Army Headquarters, which commanded the defense of all of southern Japan. The city was a communications center, a storage point, and an assembly area for troops. To quote a Japanese report, "Probably more than a thousand times since the beginning of the war did the Hiroshima citizens see off with cries of 'Banzai' the troops leaving from the harbor." On the other hand, it was not considered important enough by the U.S. to have been targeted for significant bombing prior to August 1945.

The center of the city contained a number of reinforced concrete buildings as well as lighter structures. Outside the center, the area was congested by a dense collection of small wooden workshops set among Japanese houses; a few larger industrial plants lay near the outskirts of the city. The houses were of wooden construction with tile roofs. Many of the industrial buildings also were of wood frame construction. The city as a whole was highly susceptible to fire damage.

Some of the reinforced concrete buildings were of a far stronger construction than is required by normal standards in America, because of the earthquake danger in Japan. This exceptionally strong construction undoubtedly accounted for the fact that the framework of some of the buildings which were fairly close to the center of damage in the city did not collapse. Another is that the blast was more downward than sideways; this has much to do with the "survival" of the Prefectural Promotional Hall (pictured), which was only a few metres from the aiming point. (The ruin was made a UNESCO World Heritage site in 1996[1] over the objections of the US and China.[2])

The population of Hiroshima had reached a peak of over 380,000 earlier in the war but prior to the atomic bombing the population had steadily decreased because of a systematic evacuation ordered by the Japanese government. At the time of the attack the population was approximately 255,000. This figure is based on the registered population, used by the Japanese in computing ration quantities, and the estimates of additional workers and troops who were brought into the city may not be highly accurate.

Hiroshima was the primary target of the first U.S. nuclear attack mission. The mission went smoothly in every respect. The weather was good, and the crew and equipment functioned perfectly. In every detail, the attack was carried out exactly as planned, and the bomb performed exactly as expected.

The bomb exploded over Hiroshima at 8:15 on the morning of August 6, 1945. About an hour previously, the Japanese early warning radar net had detected the approach of some American aircraft headed for the southern part of Japan. The alert had been given and radio broadcasting stopped in many cities, among them Hiroshima. The planes approached the coast at a very high altitude. At nearly 8:00 A.M., the radar operator in Hiroshima determined that the number of planes coming in was very small - probably not more than three - and the air raid alert was lifted. The normal radio broadcast warning was given to the people that it might be advisable to go to shelter if B-29's were actually sighted, but no raid was expected beyond some sort of reconnaissance. At 8:16 A.M., the B-29 Enola Gay dropped the atomic bomb called "Little Boy" over the central part of the city and the bomb exploded with a blast equivalent to 12,000 tons of TNT, killing 80,000 outright.

At the same time, Tokyo control operator of the Japanese Broadcasting Corporation noticed that the Hiroshima station had gone off the air. He tried to use another telephone line to reestablish his program, but it too had failed. About twenty minutes later the Tokyo railroad telegraph center realized that the main line telegraph had stopped working just north of Hiroshima. From some small railway stops within ten miles of the city there came unofficial and confused reports of a terrible explosion in Hiroshima. All these reports were transmitted to the Headquarters of the Japanese General Staff.

Military headquarters repeatedly tried to call the Army Control Station in Hiroshima. The complete silence from that city puzzled the men at Headquarters; they knew that no large enemy raid could have occurred, and they knew that no sizeable store of explosives was in Hiroshima at that time. A young officer of the Japanese General Staff was instructed to fly immediately to Hiroshima, to land, survey the damage, and return to Tokyo with reliable information for the staff. It was generally felt at Headquarters that nothing serious had taken place, that it was all a terrible rumor starting from a few sparks of truth.

The staff officer went to the airport and took off for the southwest. After flying for about three hours, while still nearly 100 miles from Hiroshima, he and his pilot saw a great cloud of smoke from the bomb. In the bright afternoon, the remains of Hiroshima were burning.

Their plane soon reached the city, around which they circled in disbelief. A great scar on the land, still burning, and covered by a heavy cloud of smoke, was all that was left of a great city. They landed south of the city, and the staff officer immediately began to organize relief measures, after reporting to Tokyo.

Tokyo's first knowledge of what had really caused the disaster came from the White House public announcement in Washington, sixteen hours after the nuclear attack on Hiroshima. By the end of 1945, it is estimated that 60,000 more people died due to nuclear fallout sickness. However, this total does not include longer term casualties from radiation exposure.

Starting almost immediately after the conclusion of World War II, and continuing to the present day, the dropping of atomic bombs on the cities of Hiroshima and Nagasaki has been questioned. Their use has been called barbaric since, besides destroying a military base and a military industrial center, tens of thousands of civilians were killed. Some have claimed that the Japanese were already essentially defeated, and that use of the bombs was unnecessary. Some have also suggested that a demonstration of an atomic bomb in an uninhabited region should have been attempted.

In reply, defenders of the decision to use the bombs say that it is almost certain that the Japanese would not have surrendered without their use, and that hundreds of thousands - perhaps millions - would have perished in the planned U.S. invasion of Japan. To support their argument, they point out that the Japanese agreed to surrender only after the second bomb was dropped, when it was evident that the first was not an isolated event, and future prospects were for a continuing rain of such bombs. (In actuality, the U.S. did not have another atomic bomb ready after the bombing of Nagasaki due the difficulty of producing fissile material.) Regarding the suggestion of a demonstration, they maintain that, given the mind-set of the Japanese at the time, it is unlikely that any conceivable benign demonstration would have induced surrender.

Others contend that Japan had been trying to surrender for at least two months, but the US refused by insisting on an unconditional surrender—which they did not get even after the bombing, the bone of contention being retention of the Emperor.[3],[4]

For additional discussion of this issue, see aerial bombing of cities, strategic bombing, and relevant sections of the article on Japan.

Tens of thousands of people marked the 40th anniversary of the atomic bombing of the city on August 6, 1985.

see also: Hiroshima Peace Memorial

After the war
Hiroshima was rebuilt after the war, with new modern buildings rising all over the city.

关于城市广岛在第二次世界大战的资料.