Whatever goes upon two legs is an enemy.
Whatever goes upon four legs, or has wings is a friend.
No animal shall wear clothes.
No animal shall sleep in a bed.
No animal shall drink alcohol.
No animal shall kill another animal.
All animals are equal.
The animals also agree that no animal shall ever enter the farmhouse, and that no animal shall have contact with humans. This commandments are summarised in the simple phrase: "Four legs good, two legs bad". After some time, Jones comes back with some other men from the village to recapture the farm. The animals fight bravely, and they manage to defend the farm. Snowball and Boxer receive medals of honour for defending the farm so bravely. Also Napoleon, who had not fought at all, takes a medal. This is the reason why the two pigs, Snowball and Napoleon, often argue. When Snowball presents his idea to build a windmill, to produce electricity for the other animals, Napoleon calls nine strong dogs. The dogs drive Snowball from the farm, and Napoleon explains that Snowball was in fact co-operating with Mr Jones. He also explains that Snowball in reality never had a medal of honour, that Snowball was always trying to cover up that he was fighting on the side of Mr Jones. The animals then start building the windmill, and as time passes the working-time goes up, whereas the food rations decline. Although the "common" animals have not enough food, the pigs grow fatter and fatter. They tell the other animals that they need more food, for they are managing the whole farm. Some time later, the pigs explain to the other animals that they have to trade with the neighbouring farms. The common animals are very upset, because since the revolution there has been a resolution that no animal shall trade with a human. But the pigs ensure them that there never has been such a resolution, and that this was an evil lie of Snowball. Shortly after this decision the pigs move to the farmhouse. The other animals remember that there is a commandment that forbids sleeping in beds, and so they go to the big barn to look at the commandments. When they arrive there they can't believe their eyes, the fourth commandment has been changed to: "No animal shall sleep in bed with sheets". And the other commandments have also been changed: "No animal shall kill another animal without reason", and "No animal shall drink alcohol in excess". Some months later a heavy storm destroys the windmill, which is nearly finished. Napoleon accuses Snowball of...