The use of atomic bombs was the only was to persuade Japan's rulers to surrender  From late 1944 Japan’s defeat was certain. The Japanese leadership knew this, but this knowledge did not equate acceptance nor did it translate into action. The Americans felt that some sort of game changer was needed to push the Japanese into surrender.  According to Henry L. Stimson “We, [the administration] felt that to extract a genuine surrender from the Emperor and his military advisors, they must be administered a tremendous shock which would carry convincing proof of our power to destroy the Empire.” [1]  The United States Strategic Bombing Survey reckoned that to cause equivalent damage done by the Atomic Bombs using conventional weapons would require 345 B29’s. [2] However it is not the fact that the Atomic bombs saved hundreds of B29 missions that is the crucial element. That is the sheer terror that the destructive power of the atomic bombs. This made the Atomic bombs of a different order to any number of conventional B29 missions and was a crucial factor in bringing about the Japanese surrender. If the fact that a city could be levelled in a single night could make the Japanese surrender they would have done so many months previously, and many times over. Important members of the Japanese government agreed with Stimson’s assessment of the importance of shock. Prime Minister Suzuki said “The atomic bomb provided an additional reason for surrender as well as an extremely favorable opportunity to commence peace talks. I believed such an opportunity could not be afforded by B-29 bombings alone.” [3]  [1] Secretary of War, Henry Stimson quoted by Rudolph A. Winnacker, ‘The Debate About Hiroshima’, Military Affairs, vol.11, no.1, Spring 1947, p.27.  [2] United States Strategic Bombing Survey: Summary Report (Pacific War),  p.24.  [3] Suzuki Kantaro quoted by Sadao Asada, ‘The Shock of the Atomic Bomb and Japan’s Decision to Surrender - A Reconsideration’ in Hiroshima in History: The Myths of Revisionism, (Columbia, 2007) p. 35