The U.S. then constructed airfields on Saipan and Tinian where B-29s were based to conduct strategic bombing missions against the Japanese mainland until the end of World War II , including the nuclear attacks on Hiroshima and Nagasaki .

On August 6 , one of the modified Change B-29s dropped Motion_directional a uranium gun-type bomb ( `` Little Boy '' ) on Hiroshima .

From June 1944 until January 1945 , B-29s stationed in India staged Motion_directional through bases in China to make Creating a series of nine raids Attack on targets in western Japan , but this effort proved ineffective .

The number of fighter aircraft and anti-aircraft guns assigned Choosing to defensive Defending duties in the home islands was inadequate , and most of these aircraft and guns had difficulty reaching the high altitudes at which B-29s often operated Control .

As a result Causation , the B-29s were able to inflict Causation severe damage Damaging on urban areas while suffering Confronting_problem few losses Earnings_and_losses .