Snowball (a pig) Timeline and Summary

Snowball helps Napoleon and Squealer to develop Animalism and then leads the animals in cleaning human paraphernalia off the farm after the rebellion.
He writes out the Seven Commandments.
Snowball forms "Animal Committees" and teaches everyone to read and write, but it doesn't go so well.
To simplify things, he reduces the Seven Commandments to "Four legs good, two legs bad."
Snowball runs tactics in the Battle of the Cowshed and is awarded "Animal Hero, First Class."
Pretty soon, Napoleon and Snowball start fighting. Snowball wants to spread the revolution; Napoleon wants to gain more power. Snowball wants a windmill; Napoleon wants to pee on it.
Napoleon's dogs run Snowball off the farm.