The Animals on Manor Farm are being mistreated by the owner of the farm Mr. Jones. So the eldest pig Old Major has rallied up all the animals to start a rebellion. 3 days later Old Major dies in his sleep and his ideas of a rebellion have been started. As two pigs: Squealer and Snowball and a boar: Napoleon make up a group of thought called Animalism. So Snowball and Napoleon take the role of decision makers on the farm
The animals kick out Jones in a glorious fashion and start running the farm animal style. Napoleon and Snowball are now in control, they use the motto "Four legs good, Two legs bad." For some time the animals run the farm very smoothly.
After some time, Jones gathered some men and attacked back to retake the farm in the battle of the Cowshed, and the humans were defeated by the animals. Before the fight, Snowball made the idea of a power generating windmill. Napoleon and Snowball argued very much on this and Snowball was kicked off of the farm.