what is snowball role in the battle of the cowshed? why isnt napoleon role in the battle explained?

Snowball is the battle plan organizer. He reads many famous books about war and strategy like Julius Caesar. Snowball anticipates Farmer Jones's return and carries out his battle plan. He organizes the animals’ attack and defence. Snowball even charges farmer Jones himself and takes a bullet. Napoleon really does not have a role. It is implied that he did not even fight.