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| 1940 from April 4 |
| | | More than 4000 Polish officers are massacred at Katyń on Stalin's orders | |
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| 1940 April 5 |
| | | Inactivity during the Phoney War prompts Neville Chamberlain to assure the House of Commons that Hitler has 'missed the bus' | |
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| 1940 April 9 |
| | | German ships and marines occupy the harbours of neutral Denmark and Norway | |
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| 1940 April 9 |
| | | The German invasion of Norway includes the world's first airborne assault, with troops arriving by plane to attack the airports of Oslo and Stavanger | |
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| 1940 April 10 |
| | | Allied ships on patrol in the North Sea, soon followed by troops, rush to the defence of Norway | |
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| 1940 May 10 |
| | | German tanks cross the borders into neutral Netherlands, Luxembourg and Belgium | |
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| 1940 May 10 |
| | | After the German invasion of the Netherlands and Belgium, Winston Churchill replaces Chamberlain as the British prime minister | |
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| 1940 May 10 |
| | | German troops force their way into France through the Ardennes, launching the Battle of France | |
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| 1940 May 11 |
| | | The French rely on the heavily fortified Maginot Line to keep out the Germans, but they outflank it | |
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| 1940 May 12 |
| | | Only two days after crossing the Netherlands border, a German division reaches the coast near Rotterdam | |
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