- 1939 3 Sep The Battle of the Atlantic begins just hours into the war, when the British liner 'Athenia' is sunk.
- 1939 3 Sep Britain and France declare war on Germany over the invasion of Poland - the start of World War Two.
- 1943 3 Sep Canadian troops lead the invasion of Italy as the Allies return to mainland Europe for the first time.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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