How was Snowball used by Napoleon to frighten the other animals?

One night in November, violent winds ravage the farm and destroy the windmill. Napoleon quickly blames the destruction on Snowball. He sentences Snowball to death and offers half a bushel of apples and the title of “Animal Hero, Second Class” to any animal that detains him. There is a track of pig footprints leading to the hedge, which Napoleon attributes to Snowball. Then Napoleon rouses the animals to action, saying, “Forward, comrades! Long live the windmill! Long live Animal Farm!” (83).