On August 6, 1945, the US dropped an atomic bomb (Little Boy) on Hiroshima in Japan. Three days later a second atomic bomb (Fat Man) was dropped on the city of Nagasaki. These are the only occasions nuclear weapons have ever been used in war.

Reasons for the bombing
Many reasons are given as to why the US administration decided to drop the atomic bomb on Hiroshima and Nagasaki, including the following:
-The United States wanted to force Japan’s surrender as quickly as possible to minimise American casualties.
-The United States needed to use the atomic bomb before the Soviet Union entered the war against Japan to establish US dominance afterwards.
-The United States wanted to use the world’s first atomic bomb for an actual attack and observe its effect.

Shortly after successfully testing history’s first atomic explosion at Trinity, New Mexico, on July 16, 1945, the order to drop the atomic bomb on Japan was issued on July 25.

The impact of the bombing on Hiroshima
Hiroshima stands on a flat river delta, with few hills to protect sections of the city. The bomb was dropped on the city centre, an area crowded with wooden residential structures and places of business. These factors meant that the death toll and destruction in Hiroshima was particularly high.

The firestorm in Hiroshima ultimately destroyed 13 square kilometres (5 square miles) of the city. Almost 63% of the buildings in Hiroshima were completely destroyed after the bombing and nearly 92% of the structures in the city had been either destroyed or damaged by blast and fire.

It is believed that up to 200,000 people died in total as a result of the bombing of Hiroshima.

The impact of the bombing on Nagasaki
Due to the hilly geography of Nagasaki and the bombing focus being away from the city centre, the excessive damage from the bombing was limited to the Urakami Valley and part of downtown Nagasaki. The centre of Nagasaki, the harbour, and the historic district were shielded from the blast by the hills around the Urakami River.

The nuclear bombing did nevertheless prove devastating, with almost a quarter of Nagasaki’s buildings being consumed by flames, but the death toll and destruction was less than in Hiroshima. It is believed that up to 140,000 people died in total as a result of the bombing of Nagasaki.

The fact that the Nagasaki bomb was more powerful and also the narrowing effect of the surrounding hills did mean that physical destruction in the Urakami Valley was even greater than in Hiroshima. Virtually nothing was left standing.

Paper cranes
The city of Hiroshima invites people from around the world to participate in making paper cranes to remember those who died in Hiroshima and Nagasaki. This action started in memory of Sadako who was two years old when the atomic bomb was dropped on Hiroshima and later died of leukaemia caused by the exposure to nuclear radiation. Believing that folding paper cranes would help her recover, she kept folding them until she passed away on October 25th, 1955, after an eight-month struggle with the disease.

Sadako’s death inspired a campaign to build a monument to pray for world peace. The Children’s Peace Monument was built with funds donated from all over Japan. Now, approximately 10 million cranes are offered each year in front of the Children’s Peace Monument.

Anyone may place paper cranes before the Children’s Peace Monument in Peace Memorial Park. If you can’t go to the park yourself you can send cranes to the following address:
Peace Promotion Division
The City of Hiroshima
1-5 Nakajima-cho Naka-ku
Hiroshima 730-0811 JAPAN

You are asked to include your name, the name of your organisation (if you are participating as a school or any other group), your address (or the address of the organisation), your e-mail address, the number of cranes, and any message you wish to submit. This way your information can be submitted to the Paper Crane database and your desire for peace will be recorded.

For instructions on how to fold paper cranes, see our peace education resource Sadako’s Cranes for Peace.