This is a quote from the book "Animal Farm" by George Orwell
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Meanwhile Frederick and his men had halted about the windmill. The animals watched them, and a murmur of dismay went round. Two of the men had produced a crowbar and a sledge hammer. They were goin g to knock the windmill down.

“Impossible!” cried Napoleon. “We have built the walls far too thick for that. They could not knock it down in a week. Courage, comrades!”

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