3. What event inspired the animals to attack Frederick's men at the Battle of the Windmill?

The animals attack Frederick and his men because they are going after the windmill, and the windmill is a symbol of Animal Farm. The windmill is symbolic of the animals' success in owning their own farm.The pigs feel that the Battle of the Windmill was a success, but the other animals didn't think so. They thought that it was a disaster because the windmill was ruined. The pigs convinced them that it was a success.

Explanation:

the answer is "began" because it is a action that can be done