"Snowball destroyed the windmill! I want him dead comrades!"
" I don't think it was him this time, or the last."
"Snowball did this comrades!"
Napoleon decided to build the windmill even though him and Snowball disagreed over it. The animals worked very hard on it for a long time.
One stormy night, the wind knocks over the near complete windmill. Napoleon knows that it is the wind, but he frames it on Snowball to get total power over him. The other animals believe his lies against Snowball.
Napoleon keeps on framing basic problems on Snowball, even though Snowball didn't do any of them. Some of the other animals like Boxer are starting to catch on to his lies, like saying that he tried to make the animals lose at the Battle of the Cowshed.