Animal Farm shows how the minority in power uses vague language, propaganda, and misinformation to control the thoughts and beliefs of the majority in the lower classes. The pigs, especially Squealer, become extremely sophisticated and effective in their attempts to rewrite the rules of Animal Farm and Animalism. They even revise the farm's entire history in order to mislead the other animals into believing exactly what they say. By the end of the novel, the animals on the farm believe Snowball fought against them at the Battle of the Cowshed even though they saw him fight with them. They believe life on the farm has improved even though they have less food than ever, and that Napoleon has their best interests at heart even though he kills those who disagree with him. As the only literate animals on the farm, the pigs maintain a monopoly on information that they use to build and hold their power.