How did Napoleon and Squealer attempt to change history?

Squealer explains to the animals that Napoleon had never really opposed the windmill—in fact, it was “his own creation,” which Snowball had copied. With evident pride, Squealer explains that Napoleon’s feigned opposition to the windmill was simply a “maneuver” in his plan to expel Snowball for disobedience; it was a brilliant example of “tactics” (72).