The so-called Manhattan Project was actually the U.S. War Department's program to develop an atomic bomb, and in early 1939, the German chemist O. Hahn and the physical chemist F. Strassmann published a paper on the fission phenomenon of uranium nuclei. Within a few weeks, scientists in many countries verified the discovery and further suggested that it was possible to create conditions for this fission reaction to proceed autonomously, thus opening up a broad prospect of using this new energy source to create wealth for mankind.

However, like many new scientific and technological discoveries throughout history, the development of nuclear energy was first and foremost used for military purposes, namely the creation of powerful atomic bombs, and the process was influenced and constrained by the social and political conditions of the time. As early as February 1937, Germany began to implement the "uranium program" with the aim of building an atomic bomb.

As a result of Hitler's brazen war of aggression against Europe, a large number of European scientists, led by physicist J. F. Joliot-Curie, were forced to emigrate, mainly to the United States. In the United States, the Hungarian physicist Zilard, who moved from Europe. Leo first considered that once fascist Germany mastered the technology of the atomic bomb, it could have serious consequences.

By Zilard. Leo and several other scientists who had emigrated to the United States from Europe rushed to the attention of the U.S. government in August 1939 when physicist Albert Einstein wrote a letter to U.S. President Roosevelt suggesting the development of an atomic bomb.

However, the U.S. government was not very interested in this, and only $6,000 was allocated at first, and it was not until the Japanese attack on Pearl Harbor that it was expanded, and by August 1942 it had developed into a huge project codenamed the "Manhattan Project District". About 600,000 people were directly employed, and more than 2 billion US dollars were invested.

In order to build the atomic bomb before Nazi Germany, the Manhattan Project gathered the best nuclear scientists from Western countries except Nazi Germany at that time, and mobilized more than 100,000 people to participate in the project.

According to the original historical development, the Manhattan Project lasted three years and cost $2 billion, and finally successfully carried out the world's first nuclear explosion on July 16, 1945, and built two practical atomic bombs as planned, and the whole project was a complete success.

But thanks to the emergence of Chen Feng, a large number of history has undergone fundamental changes. Especially the early outbreak of World War II and the early outbreak of the Pacific War. The Manhattan Project of the United States was greatly advanced, and it entered the explosive test stage 11 months ahead of schedule, and as long as the test was successful, it could make a practical atomic bomb.

In the early hours of July 30, 1944, in a desert area in Alamogordo, New Mexico. With a huge mushroom cloud rising. The world's first atomic bomb was successfully tested.

Originally, according to the meaning of the scientists. After the success of the desert experiment, a sea test was to be carried out on an atoll in the Pacific, but President Roosevelt refused. He ordered the General Command of the Manhattan Project to immediately assemble a utility atomic bomb.

On August 5, 1944, Roosevelt telegraphed Chen Feng, Stalin and others, inviting them to Washington, D.C., to hold a war conference against Japan.

In Washington, Chen Feng and others were warmly received by the US Government, and on the morning of 6 August, as soon as the meeting began, Roosevelt distributed a stack of materials to Chen Feng and others.

Seeing the huge picture of the mushroom cloud on the document, Chen Feng sighed in his heart, knowing that the United States had finally succeeded in manufacturing the atomic bomb, and it seemed that the landing operation might be canceled.

Sure enough, after Chen Feng and others read the document, Roosevelt told several people present the news of the success of the atomic bomb test, and among the leaders of the countries attending the meeting, only China did not carry out research on the atomic bomb, and both Britain and the Soviet Union had their own "Manhattan Project," so after learning of the success of the atomic bomb test, Stalin and others were surprised, delighted, and worried.

The atomic bomb is not an ordinary bomb, although Stalin and others do not know its power, but according to the estimation of scientists from various countries, only one such weapon is enough to destroy a city of one million people, which is very terrifying. Now the United States was the first to master this weapon, which was definitely a great threat to the Soviet Union. Fortunately, the two sides are allies now, and the atomic bomb will not fall on the heads of the Soviets for the time being.

As Chen Feng thought, Roosevelt proposed that before landing on the Japanese mainland, the atomic bombs should be used to carry out destructive strikes on major cities in Japan, and then carry out landing operations after destroying the living forces of the Japanese army, so that the losses of the Allied forces would be much smaller.

Chen Feng found that Roosevelt actually did not know much about the performance of the atomic bomb, or did not trust the power of the atomic bomb very much, so he was not ready to stop the landing, but to take a two-pronged approach.

Chen Feng was secretly happy in his heart, after the Japanese tasted the power of the atomic bomb, I was afraid that they would take the initiative to surrender without landing, and the preliminary preparations of the allies were in vain, but he did not say such words.

According to the agreement of China, the United States, the Soviet Union, and the United Kingdom, each of the four countries dispatched 800,000 troops and 500 ships to approach the Japanese archipelago from four directions, east, west, south, and north, and prepared to land on the Japanese mainland on August 22, 1944. Prior to this, on August 15, the U.S. military would drop an atomic bomb on Tokyo, the capital of Japan, and two other cities to undermine the Japanese government's confidence in resistance.

On August 12, Chen Feng returned to Chongqing from Washington, and communicated with the government on the same day, telling Mao Zhou and others that Japan's surrender was imminent, and the Chinese government should do a good job in prosecuting high-ranking Japanese military officers, politicians, and big businessmen, and could start counting China's war losses.

At 8 o'clock in the morning of August 15, 1944, the B-29 Enola of the 393D Bombardment Squadron of the U.S. Army. The Guy took off from Pada Air Base on Tinian Island and had a flight time of about 6 hours. Honora. HMS Guy and Charles. The Great Artist, a scientific observatory under the command of Major W. Sweeney, and the photographic observatory of Captain George Marquardt traveled to Tokyo, Japan.

Three B-29 US planes entered Japan's airspace from a high altitude. This is because during this period of time, Allied warplanes have been carrying out non-stop air raids on the Japanese mainland, and hundreds of warplanes have been mobilized. Now the Japanese government has taken an almost indifferent attitude towards the sporadic entry of Allied warplanes into Japan's airspace.

According to the plan of the US military, after the B-29 bombers loaded with atomic bombs enter Japan's airspace, they will determine the bombing sites according to the weather conditions, and Washington has only given a few approximate areas such as Kyoto, Hiroshima, Kokura, and Yokohama. Among them, Kyoto City (Tokyo) is an AA target, Hiroshima City is an AA target, Yokohama City is an A target and Kokura City is an A target.

On August 15, the weather in Tokyo was fine and cloudless. Shortly after the U.S. warplanes entered Tokyo's airspace, Japan's early warning radar detected some U.S. planes approaching southern Japan. Many cities have issued air raid alerts. Including Tokyo and Hiroshima and Yokohama.

But surprisingly. Approaching 9:20 a.m., the radar operators in Tokyo decided to lift the air raid siren, since the signals displayed on the radar showed that the number of enemy aircraft entering Japan was small. Probably no more than three. In order to save fuel and aircraft. Japan has already decided not to intercept small aircraft formations.

However, the radar operator called the anti-aircraft battery. They were asked to put them on alert, and as soon as the enemy aircraft entered the city of Tokyo, the air defense units immediately returned fire.

As a result of the lifting of the air defense alarm. Therefore, the Japanese people on the ground did not care, because they learned from the radio that there were only three enemy fighters this time, and their own air defense units were already in position, and they would definitely shoot down or drive the enemy away soon. As a result, almost all citizens in the Tokyo metropolitan area are working normally.

At 9:50:33, the sight gauge on the US plane carrying the atomic bomb was aimed at the Japanese Kyoto Garrison Command and the nearby Japanese military camp, and the automatic bomb dropping device was activated. After 60 seconds, the atomic bomb fell into the air through the open hatch. At this point, the plane made a 155° turn and dived down; In an instant, the flight altitude dropped by more than 300 meters. This is done to stay as far away as possible from the site of the explosion.

Forty-five seconds later, the atomic bomb exploded 600 meters above the ground, emitting a dazzling white flash of intense light, and a deafening explosion occurred over the center of Tokyo. In an instant, a huge mushroom-shaped cloud of smoke rose from the city, and hundreds of pillars of fire were erected, and Tokyo was immediately reduced to a sea of scorching fire.

Due to crosswinds, the atomic bomb deviated about 500 meters from the aiming point of the garrison headquarters and was detonated 600 meters above the Japanese Army University. It has an explosive yield of 16,000 tons of TNT explosives. The total radius of destruction was about 1.6 km, and fires broke out within 11 km². About 12 square kilometers of urban areas were destroyed, and about half of Tokyo's buildings were devastated.

The intense light waves produced by the atomic bomb blinded thousands of people; The heat of 1 billion degrees has reduced everything to ashes; The wind created by the shock wave destroyed all the buildings. People and things under the influence of the epicenter are falling apart like atoms apart. A little farther away from the center, the remains of men and women and children could be seen burned down in a flash. Farther afield, some were lucky enough to be alive, but they were either badly burned or their eyes burned into two holes. At 16 km away, one can still feel the sultry airflow. Due to Tokyo's dense population, nearly 100,000 people were killed as a direct result of the explosion, and nearly 100,000 others were injured in the atomic bombing and the resulting storm.

Less than two hours after the atomic bombing, the governments of China, the United States, the United Kingdom, and the Soviet Union issued another statement, urging the Japanese government to surrender immediately and unconditionally, otherwise it would be dealt a more severe blow.

However, the tragedy in Tokyo did not make Japan immediately agree to accept the ultimatum of the allies, nor did it surrender unconditionally. The Japanese government and base camp tried their best to cover up the truth about Tokyo, claiming that a meteorite had fallen in the city of Tokyo.

Japanese intelligence agencies believe that the United States does not have much raw materials to make atomic bombs, and believes that the American military only has one atomic bomb, so they refuse to surrender unconditionally.

On August 17, 1944, the U.S. military dropped an atomic bomb on Nagasaki and Hiroshima on Japan. In both cities, 150,000 people died in a single day, and another 50,000 in the following three days.

On the afternoon of the 17th, the allies once again issued a urging on the Japanese government to surrender immediately and unconditionally, otherwise Yokohama and Kokura would be the next targets, and the allies gave the Japanese government three days, and if the Japanese government did not give a clear reply after three days, the allies would carry out a nuclear attack on Japan and carry out a landing operation at the same time.

On August 22, 1944, the Emperor of Japan issued a surrender edict, announcing unconditional surrender. (To be continued......)