Chronology of World War II
A-bombs to be dropped on Japan
Saturday, July 21, 1945 www.onwar.com
In Occupied Germany... The Potsdam Conference continues. Churchill, Truman and Stalin confer on politics and strategy, in a town near Berlin. Although very little information about the progress of the Big Three Conference is being made public, it is reported that much has been done. The leaders have spent an average of almost 3 hours together since their first meeting on Tuesday and there are also frequent and lengthy meetings between the foreign affairs ministers (Eden, Byrnes and Molotov), committees and subcommittees of experts. In a private meeting Truman and Churchill agree to drop the atomic bomb on Japan if it fails to surrender unconditionally. Meanwhile, Allied representatives select Nuremberg as the location of the trial of the main Nazi war leaders.

From the United States... American radio broadcasts call on Japan to surrender or face destruction.

In China... Authorities in Chungking say that Chinese forces are closing in on Kweilin, the largest Japanese airbase and capital of the south China province of Kwangsi.

In Burma... Heavy fighting took place along the Sittang river as the Japanese continued their counterthrusts.

In the Greater Sunda Islands... On Borneo, Dutch and native troops are reported to be advancing northeast from Balikpapan. Allied motor torpedo boats operating on the northwest coast have shelled the Jesselton area and caused heavy explosions and fires ashore.

In the Tsushima Strait... US Navy aircraft attack shipping.


This chronological study of the Second World War provides a comprehensive day-by-day account of WWII. While focused on the military history of the war, with an emphasis on the battles and campaigns fought, the timeline includes social and political history as well. Some Holocaust related events are already recorded and additional updates are pending. In so far as possible, the images included in this presentation are pictures from the given days. Additional information and images are welcome through the feedback form found on the index.