To the extent that the animal's revolt ousts the humans from the farm, it is a success, but as far as achieving any of the aims of the revolution, the animal's revolt is an utter failure.
At the beginning, listening to Old Major before the revolt, and in the early days after the rebellion, the animals are full of hope they can build an equal society with prosperity for all. They start out with the idea that all the animals will be equal. They dream of pleasant retirements and of using the power from the windmill they will build to have heated stalls and running water. At first, they all (or almost all) work together in solidarity to make the farm a success.
But the pigs quickly take power, and under the corrupt leadership of Napoleon , they commandeer almost all the goods the farm produces for themselves. At the end of the book, visiting human farmers are impressed with how much work the pigs get out of the other animals at such little expense. The pigs even change the essential commandment...
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