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Hitler had been expanding into the Sudetenland and other areas of Europe, Britain had told Hitler that a line would be drawn in Poland. Any attempt to invade Poland by Germany would result in war. On September 1st Hitler did just that and consequently war broke out.

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12y ago
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12y ago

Their invasion of Poland on 1st September 1939

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12y ago

The action which was caused by germany which led to to the start of World War 2 in the European theatre was the Invasion of poland in september 1939

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9y ago

Germany's bliizkrieg against Poland.

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10y ago

The German invasion of Poland.

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Q: What German action on September 11939 caused Britain and France to declare war on Germany?
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Related questions

In which year and month did Britain and France declare war on Germany?

September 1939


How did Britain and France declare war on Germany?

Because at 1 September 1939 Germany invaded Poland.


What 2 countries declared war on Germany?

Britain and France on 3rd September 1939 and Poland 2 days before on 1st September


Which two countries where first to declare war on Germany?

France and Britain declared war onto Nazi Germany on September 1st 1939. This was the official date of the starting of World War 2.


What invasion forced Britain and France to declare war on Germany in 1939?

The invasion of Poland which began in September 1939


What led France and Britain to declare war against Germany to begin wolrd war 2?

Britain and France had a defence agreement with Poland. On 1 September 1939, German troops invaded Poland, so on 3 September 1939, Britain and France declared war on Germany.


When did Britain and France declare war against Germany and why?

Britain and France declared war on Germany on September 3, 1939. The reason was because Germany had launched a military invasion of Poland two days earlier, even though Britain and France had told Germany not to do so.


When did France and Britain declare war on Germany?

1939


What event made Great Britain and France finally declare war on Germany?

The German invasion of Poland on September 1, 1939.


When did France and great Britain declare war against Germany and why?

Great Britain and France declared war on Germany in 1939, because germany had invaded land that Great britain had to protect for france.


When did great Britain and France declare war against Germany and why?

Great Britain and France declared war on Germany in 1939, because germany had invaded land that Great britain had to protect for france.


What caused England to declare war and start World War 2?

because Neville chamberlain sent a message to Hitler by radio telling him if he didn't get out of Poland by 11 am on September 1st we would declare war he did not get out of Poland so we did declare war.