What happened when Nazi Germany invaded Poland in September 1939?

On 1 September 1939, German forces entered Polish territory and launched a large-scale invasion that would begin the Second World War. Foreign observers later described the speed and force of the operation as Blitzkrieg, or “lightning war,” though the term was not part of an official German militar…

On 1 September 1939, German forces entered Polish territory and launched a large-scale invasion that would begin the Second World War. Foreign observers later described the speed and force of the operation as Blitzkrieg, or “lightning war,” though the term was not part of an official German military...

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