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3 September 1939 - 9 am (British Summer Time) - Ultimatum delivered to Germany, demanding an end to the invasion of Poland and stating that unless a 'satisfactory response' was received within two hours, Britain would go to war against Germany. Same date, 11.15 am (BST) Chamberlain delivered a radio broadcast, announcing that no response had been received from Germany, and that Britain and Germany were therefore at war.

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16y ago

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