Chronology of World War II
Britain, France declare war on Germany
Sunday, September 3, 1939 www.onwar.com
In London... The British ultimatum to Germany expires at 1100 hours and at 1115 hours, Chamberlain broadcasts to announce that the war has begun. Chamberlain forms a War Cabinet, which includes Churchill as First Lord of the Admiralty (which is signaled to all Royal Navy ships and installations with the message "Winston is back") and Eden as Secretary for the Dominions. Churchill and Eden have been the most prominent opponents of an appeasement policy. A Ministry of Economic Warfare is established. The British government also announces the implementation of a blockade of Germany. At 1135 hours, as if to confirm the state of war, there is an air-raid warning in London but it is a false alarm.

In Paris... In the afternoon, at 1700 hours, the French declare war before their ultimatum expires.

In Poland... The Polish Lodz Army is now in retreat after being beaten in the frontier battles with Army Group South. German 10th Army ( General Reichenau) forces have crossed the Warta River in some areas while 14th Army (General List) troops are converging on Krakow. The city of Czestochowa falls to German forces. Some Polish units penetrate into East Prussia but their position becomes untenable as German forces cut them off to the south. The Polish air force ceases to exist as an effective fighting element. In Warsaw, there are pro-British demonstrations.

In the North Atlantic... The British passenger liner, SS Athenia, is torpedoed off the northwest coast of Ireland en route to Canada by U-30 because it is mistakenly identified as an auxiliary cruiser. There are 112 dead including 28 American citizens, of some 1400 passengers including some 316 Americans. The German government is unaware of the action of the U-boat until later in the month. Britain believes that this is the start of unrestricted submarine warfare. At this time, 39 of the German fleet of 58 U-boats are at sea. Doenitz, the submarine chief, had hoped for a fleet of 300 before contemplating war with Britain.

In Britain... The 3-day evacuation of 1.5 million civilians from the larger cities to the country is completed.

Over Germany... During the night (September 3-4), British RAF aircraft drop 6 million leaflets on cities in northern Germany and the Ruhr in the first of a series of propaganda raids.

In Sydney... The Australian government declares war on Germany.

In Wellington... The government of New Zealand declares war on Germany.

In Brussels... The government of Belgium declares its neutrality. King Leopold III assumes command of the Belgium Army.


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.