Chronology of World War II
Germany to blockade Britain
Monday, September 11, 1939 www.onwar.com
In Berlin... Germany announces a counter blockade against Britain, saying that since "economic warfare was forced on her," Germany "is not only able to resist every pressure of blockade and every form of British hunger warfare, but to reply to it with the same methods."

In Germany... Cipher experts crack the British merchant ship code, identifying convoy meeting points.

In Poland... The German forces cross the River San north and south of Przemysl, in southeast Poland. The battle on the Bzura continues but the leaders of German Army Group South, Rundstedt and his Chief of Staff, Manstein, are already beginning to assemble reinforcements for German 8th Army. The Polish force at Radom is destroyed with the Germans capturing 60,000 men. The German capture of the industrial area of Upper Silesia is complete.

In Britain... Churchill begins correspondence with Roosevelt which he signs as "A Naval Person".

In London... The British cabinet decides no further attempt to bomb Germany by air will be carried out. Meanwhile, plans for the federation of India are postponed indefinitely.


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.