He didn't need to "butcher" the British Army. He could have forced their surrender.
That's literally what he tried to do! Even the (((Hollywood))) film Dunkirk shows the Nazis dropping "please surrender" notes on the allied at Dunkirk.
They used that brief warning time to escape.
>brief warning time
That brief warning time was three days.
It was certainly a blunder, not going to argue against that.
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