In early August 1945, warfare changed forever when the United States dropped two atomic bombs on Japan, devastating the cities of Hiroshima and Nagasaki and killing more than 100,000 people. America’s immediate goal was to hasten Japan’s surrender, end World War II and avoid further Allied casualties. But it also wanted to showcase to the world—the Soviet Union in particular—the hugely destructive power of its new technology. The images of Hiroshima and Nagasaki below illustrate that power: what Japan’s Emperor Hirohito called in his statement of surrender “a new and most cruel bomb.”
Hiroshima: Before and After
Aerial view of Hiroshima, Japan
On August 6, 1945, at 8:15 a.m., the crew of the B-29 bomber Enola Gay dropped the first wartime atomic bomb over Hiroshima, Japan, a bustling regional hub that served as an important military communications center, storage depot and troop gathering area. The bomb, code-named "Little Boy," detonated with an estimated 15,000 tons of TNT, destroying five square miles of the city and directly killing some 70,000 people. Final casualty numbers remain unknown; by the end of 1945, injuries and radiation sickness had raised the death toll to more than 100,000. In subsequent years, cancer and other long-term radiation effects steadily drove the number higher.
Nagasaki: Before and After
Aerial view of Nagasaki, Japan
Three days after the destruction of Hiroshima, another American bomber dropped its payload over Nagasaki, some 185 miles southwest of Hiroshima, at 11:02 a.m. Not the original intended blast site, Nagasaki only became the target after the crew found that city, Kokura, obscured by clouds. The Nagasaki explosive, a plutonium bomb code-named “Fat Man,” weighed nearly 10,000 pounds and was built to produce a 22-kiloton blast. Its destructive force wiped out about 30 percent of the city. Some 60,000 to 80,000 people died in Nagasaki, both from direct exposure and long-term side effects of radiation.
Recommended for you
VIEW MORE: Photos of the Bombing of Hiroshima & Nagasaki
READ MORE about Hiroshima and Nagasaki on HISTORY.com: