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The Invasion (Blitzkrieg) of Poland
Germany's blitzkrieg approach was characterized by extensive bombing early on to destroy the enemy's air capacity, railroads, communication lines and munitions dumps, followed by a massive land invasion with overwhelming numbers of troops, tanks and artillery. -
Great Britain and France Declare War on Nazi Germany
The United Kingdom declared war on Germany on Sunday 3 September 1939, two days after Germany invaded Poland. France also declared war on Germany later the same day.