Before the deployment of the first ever atomic bomb, the US dropped leaflets over several major cities and towns urging the citizens to leave the city and pressure the government to submit to the surrender demands, lest they be forced to deploy a new and devastating weapon.
After the deployment of "little boy" on hiroshima with devastating effect they dropped even more flyers directing the citizens to ask about what happened at Hiroshima and the news that the Russians had declared war on them too.
How (much) did the flyers affect the loss of life by making citizens evacuate and did it affect the surrendering process in any significant capacity?
Hi there -- while there's always more to be said on this question, these older answers from u/restricteddata may be of interest to you. (The short version is that while the U.S. dropped leaflets on Japanese cities warning about firebombings, there were not atomic bomb warning leaflets dropped on Japanese cities until after the atomic attacks -- Nagasaki had warning leaflets dropped on it the day after it was bombed.)
https://www.reddit.com/r/AskHistorians/comments/4dz9oh/why_didnt_many_people_evacuate_hiroshima_and/