Why the six hour gap between British and French declarations of war?

Upvote:9

Note that (according to Churchill anyway) Britain also declared war on Japan several hours before the USA did. You'll have trouble finding anyone arguing that this showed that the USA was a "junior partner".

Churchill put it down to the difference in the two governments. In the USA, a formal declaration of war requires an act of Congress. Both houses didn't get around to this until 1PM on Dec 8 (a veritable speed record for them, really). The President didn't sign the declaration until 5PM (although many argue this isn't required on a declaration of war).

Under the British system, it is entirely up to "the Government", which means the leadership of the majority party. In the Japanese case, the decision was simply made by Churchill's war cabinet, and Churchill's only formality was informing the King and his ambassadors of the decision.

Like the USA, the Third French Republic did not give its government the same lattitude to declare war that the British enjoy. Under their constitution of the time, the President of France had to declare a war, but both houses of its parliment had to approve of it. Even in an emergency, all these extra approvals take time.

Upvote:12

The timing difference merely reflected the previous difference in deadline presented to Germany for withdrawal from Poland: 11:00 am the deadline presented by Great Britain, and 5:00pm that presented by France. Both countries promptly declared war as the respective deadlines passed without any withdrawal by Germany from Poland.

The deadlines themselves had to be approved by the legislatures of both countries, and the timing differences may simply reflect the different lengths of time allowed for debate. A minimum time, probably 24 or 48 hours, would have to have been allowed after the presentation of the deadline to Germany, in case it actually wished to comply with the presented deadlines.

Update:
In The Gathering Storm on page 407, Churchill states

I learned later that a British ultimatum had been given to Germany at 9:30 P.M. on September 1, and that this had been followed by a second and final ultimatum at 9 A.M. on September 3.

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