The pigs tastes the true power being a leader. Snowball have been chased away by nine dogs because Napoleon doesn't agree with the idea to build a windmill to ease animals burden. Napoleon also declare himself as leader of the barn and the animals need to follow his instruction.
Mr. Frederick, a neighbour farmer attack the farm and exploded the windmill using the blasting powder after cheating Napoleon to purchased some timber. Even though, animals win the battle between the farmers but they also suffered a great loss.
Year after year, Napoleon behave more like human being. Eventually, the seven principles of Animalism, known as the Seven Commandments and inscribed on the side of the barn., become reduces to single principle reading "all animals ate equal, but some animals are more equal than others". Napoleon also changed the farm name to "The Manor Farm".