Final answer:
Napoleon maintained discipline on the farm through violence, punishment, propaganda, and manipulation.
Step-by-step explanation:
Napoleon maintained discipline for all the animals on the farm by using various strategies. One of the key methods he used was instilling fear and control over the animals through the use of violence and punishment. This was done through the use of his loyal enforcers, such as the dogs, who would attack and intimidate any animal that disobeyed.
In addition, Napoleon also manipulated the animals through propaganda and manipulation, controlling the narrative and information they received. This allowed him to maintain a tight grip on the farm and prevent any dissent or rebellion.