How does Squealer “spin” the Battle of the Windmill to make the animals happy and proud?

Even though the windmill is destroyed, Squealer, who was not in the battle, has the gun fired as a sign of victory. For the first time, Boxer’s faith in the value of hard work begins to flag. However, Napoleon devotes two days to celebrating the victory at the newly named Battle of the Windmill and burying the slain. He also gives himself the title, “Order of the Green Banner.”