In Animal Farm, what is the pigs’ major contribution to the Rebellion at the end of Chapter II?

Old Major dies, and under the leadership of the pigs, the
animals prepare for the Rebellion:

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The Rebellion comes much sooner than anyone
thought, and the animals break free of Jones's tyranny and drive the humans from the
farm.

By the end of chapter
two of Animal Farm, the pigs had taught themselves to read and
write. The had used an "old spelling book which had belonged to Mr. Jones's children and
which had been thrown on the rubbish heap."

After learning
to read and write, the pigs had narrowed the principles of Animalism down to seven
commandments. They used paint to write the seven commandments on the wall of the big
barn. The original commandments
were:

1. Whatever goes upon two
   legs is an enemy.


2. Whatever goes upon four legs, or has
   wings, is a friend.


3. No animal shall wear
   clothes.


4. No animal shall sleep in a
   bed.


5. No animal shall drink
   alcohol.


6. No animal shall kill any other
   animal.


7. All animals are
   equal.

The
animals began to study the commandments. The clever animals learned them right away. The
animals begin to live by the commandments. Since the pigs had learned to read and write
first, they contributed their learning to the Rebellion by creating a code for all the
animals to honor and obey.