Chapter 5 begins in January. Since it is winter, the animals cannot work. Therefore, they plan. The pigs have put themselves in the position of control. They have convinced the other animals that they are smarter and should make the decisions. The winter gives them a chance to do so.
Many meetings were held in the big barn, and the pigs occupied themselves with planning out the work of the coming season. (ch 5)
The animals believe the pigs are “manifestly cleverer” and therefore should “decide all questions of farm policy” with their decisions ratified by a vote (ch 5). Unfortunately, the pigs are not all in agreement. The altruistic Snowball and the power-hungry Napoleon do not agree. This is why Napoleon secretly plans to take power by taking the puppies and turning them into a secret police.
The pigs’ slow ascent to power is an example of the deception of revolution. By the time the other animals realize that the pigs are really in control and all animals are not equal, it is too late. Anyone who challenges the pigs is killed, so opposition dies way.
The pigs are working closer to the idea that "all animals are equal, but some animals are more equal than others" from "all animals are equal." The pigs, clearly, are more equal than the other animals. They have just enough natural intelligence to put themselves over the others.
This happens because the pigs are now stepping up their drive for supreme power. However, they do this under the guise of working for the good of all the animals. Before this, there were regular public meetings for all the animals to have a say in the running of the farm, but now these have been banned and the pigs will take all the decisions. The animals are mostly persuaded to accept the pigs as their natural leaders, as the pigs are intelligent and knowledgeable. However, they are now also backed up by fearsome guard dogs. This is the first clear sign that they are going to rule by force (although they also have the significant verbal support of the mindlessly bleating sheep). Furthermore, Napoleon has emerged as the single most powerful figure of all, having got rid of his great rival Snowball. He is also backed up by Squealer, a flatterer and master of propaganda.