Details of Battle of the Windmill? (doing a 5 paragraph essay about the topic)

In 1939, the Soviet Union and Nazi Germany signed a non-aggression pact that promised neutrality and cooperation between the two nations. In Animal Farm, Napoleon’s trade agreement with Frederick symbolizes this pact. Napoleon does not trust Frederick completely, as shown in his unwillingness to accept a check. In the same way Stalin was wary of Hitler and his goals, perhaps seeing some of his own ruthlessness and ambition in Hitler’s eyes. Napoleon’s distrust of Frederick soon turns out to be true, just as Stalin was right not to trust Hitler completely. Hitler’s forces invaded the Soviet Union in 1941, an event that Orwell mirrors in Frederick’s attack on Animal Farm. He summarizes the incredible damage that the Nazis did before their defeat in the destruction of the windmill.