Much of the next year is spent building the windmill. Boxer, an incredibly strong horse, proves himself to be the most valuable animal in this endeavor. Jones, meanwhile, forsakes the farm and moves to another part of the county. Contrary to the principles of Animalism, Napoleon hires a solicitor and begins trading with neighboring farms. When a storm topples the half-finished windmill, Napoleon predictably blames Snowball and orders the animals to begin rebuilding it.
Napoleon’s lust for power increases to the point where he becomes a totalitarian dictator, forcing “confessions” from innocent animals and having the dogs kill them in front of the entire farm. He and the pigs move into Jones’ house and begin sleeping in beds (which Squealer excuses with his brand of twisted logic). The animals receive less and less food, while the pigs grow fatter. After the windmill is completed in August, Napoleon sells a pile of timber to Frederick, a neighboring farmer who pays for it with forged banknotes. Frederick and his men attack the farm and explode the windmill but are eventually defeated. As more of the Seven Commandments of Animalism are broken by the pigs, the language of the Commandments is revised: For example, after the pigs become drunk one night, the Commandment, “No animals shall drink alcohol” is changed to, “No animal shall drink alcohol to excess.”
Boxer again offers his strength to help build a new windmill, but when he collapses, exhausted, Napoleon sells the devoted horse to a knacker (a glue-boiler). Squealer tells the indignant animals that Boxer was actually taken to a veterinarian and died a peaceful death in a hospital — a tale the animals believe.
Years pass and Animal Farm expands its boundaries after Napoleon purchases two fields from another neighboring farmer, Pilkington. Life for all the animals (except the pigs) is harsh. Eventually, the pigs begin walking on their hind legs and take on many other qualities of their former human oppressors. The Seven Commandments are reduced to a single law: “All Animals Are Equal / But Some Are More Equal Than Others.” The novel ends with Pilkington sharing drinks with the pigs in Jones’ house. Napoleon changes the name of the farm back to Manor Farm and quarrels with Pilkington during a card game in which both of them try to play the ace of spades. As other animals watch the scene from outside the window, they cannot tell the pigs from the humans.
