Once the animals have successfully overthrown Mr. Jones and after a while, Jones and a small group of men return to once again regain full control of Manor Farm. The humans resort into beating the animals back into submission but are unsuccessful. This war was called the Battle of the Cowshed.
Snowball leads the Battle of the Cowshed and headed straight for Mr. Jones, whose gun grazed Snowball's back. Snowball threw himself at Mr. Jones' legs and caused him to fly back into a pile of dung. Boxer accidentally killed a stable hand causing all the other men to run out of fear. This event showed the animals that they must be willing to die in order for Animal Farm to succeed.
"On the third Sunday after Snowball’s expulsion, the animals were somewhat surprised to hear Napoleon announce that the windmill was to be built after all. He did not give any reason for having changed his mind, but merely warned the animals that this extra task would mean very hard work, it might even be necessary to reduce their rations. "
Snowball is chased off Animal Farm by dogs ordered by Napoleon. This occurs after Snowball begins to challenge Napoleon's control, Napoleon is upset because of this so he uses fear and pain to gain back the power he craves.
Napoleon takes complete control of the farm and pursues the idea of building the windmill. Napoleon enforces new strict rules that limit the freedoms of the animals as well as changing the original seven commandments so they suit his wants.