Some of the battles that happen in World War 2 was the Europe and in Asia. The battle in Western Europe was when the Russians and the Germans sign a non-aggression pact. Adolf Hitler and Joseph Stalin agree not to invade each other's borders. The two leaders secretly plan to divide Poland and other parts of Eastern Europe between them. The battle that happen in Asia was when the U.S was brought into the war in 1941. Japan had been expanding their influences in Asia for a long time. Japan became a big country that brought into war a few times.