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Germany invaded Poland on September 1, 1939. On September 3, 1939 Britain and France declared war against Germany. The Soviet Union invaded Poland on September 17, 1939 as per the agreement of the non-aggression pact between the USSR and Germany.

1 or 3 September 1939 are generally taken as the start of World War 2 in Europe.


September 1, 1939 German forces invaded Poland against Britain's and France's approval. On September 3, 1939 they then declared war on Germany.
On 3 September 1939 after Germany failed to withdraw from Poland (which it had invaded 2 days earlier) France and Britain, followed by the countries of the Commonwealth, declared war on Germany.
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