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French declaration of war on Germany (1939)

On 3 September 1939—two days after the German invasion of PolandFrance declared war on Nazi Germany according to its defensive treaty with Poland, when France's ultimatum to Germany, issued the previous day, expired at 17:00. This occurred hours after the United Kingdom declaration of war on Germany.[1][2]

United Kingdom declaration of war on Germany (1939)

Declarations of war during World War II

Diplomatic history of World War II