After the completion of the new windmill in August, Napoleon sells the pile of timber to Frederick, who tries to pay with a check. Napoleon, however, demands cash, which he receives. Whymper then learns that Frederick's banknotes are forgeries, and Napoleon pronounces the death sentence on the traitorous human.
The next morning, Frederick and 14 men arrive at Animal Farm and attempt to take it by force. Although the humans are initially successful, after they blow up the windmill, the animals are completely enraged and drive the men from the farm. Squealer explains to the bleeding animals that, despite what they may think, they were actually victorious in what will hereafter be called "The Battle of the Windmill."
Some days later, the pigs discover a case of whisky in Jones' cellar. After drinking too much of it, Napoleon fears he is dying and decrees that the drinking of alcohol is punishable by death. Two days later, however, Napoleon feels better and orders the small paddock (which was to have been used as a retirement-home for old animals) to be ploughed and planted with barley. The chapter ends with Muriel rereading the Seven Commandments and noticing, for the first time, that the Fifth Commandment now reads, "No animal shall drink alcohol to excess.