Why did the British think the war was going to be over quickly?

They are kind of conceded

Explanation:

The british at the time always thought that they were the best and that nothing and no one could beat them. When they joined in WW1, they were promptly put in retreat and then dug trenches across europe. In WW2, they thought that since Hitler was not supposed to have a large army, he would not dare attack anyone that Britain was protecting. They were wrong.

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