Snowball is a great leader and pushes all the animals to work towards the same goals and they become very successful and Snowball even teaches them how to read and write. When Napoleon sees how successful Snowball is becoming he gets angry and jealous and sends the dogs to attack him and scare him off, then blames Snowball for doing all these awful things, hoping that when he rises to the throne all the animals will see him as a hero.
In the beginning of the book both Snowball and Napoleon worked toward the same objective, which was to drive Mr. Jones off his land, but he refused so they were gonna have to force him off. Things were perfect until Napoleons jealousy got the best of him and he scared off Snowball. After Napoleon takes over the animals slowly start dividing themselves up into different classes based on how many legs they use. If Snowball was still around this would of never happened due to how he led the animals and he kept them