What changes does Napoleon make after his dogs chase Snowball off the farm?

Only three days after Snowball’s removal, Napoleon announces plans to build the windmill and make similar improvements to the farm. 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).